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- Lewis Avery Filer had been an insurance investigator forced to retire when his company was taken over by a conglomerate. The wily Filer is now pulling daring robberies at businesses either owned or insured by the conglomerate. He utilizes a variety of tactics, including disguises. Filer also is gaining publicity as he outwits the police.
- The Vashons are planning to go after Steve for killing Chris Vashon. His grandfather wants to send Steve a message that he's going to die. Honore, Chris' father, objects, unsuccessfully. Steve gets the message and goes to see Honore Vashon, who denies having anything to do with it. Chris's grandfather then hires someone to kill Steve but the attempt fails. Steve then has Honore placed under surveillance which the latter discovers and becomes very careful. He stops using his phone. Eventually he arranges a secluded meeting with his father who tells Honore they need to find someone outside the islands to take care of Steve. Eventually Honore evades the surveillance long enough to meet with the assassin. Steve knows there's someone out there with orders to kill him so he needs to find the assassin first rather than vice versa.
- 1968–198050mNot Rated8.6 (190)TV EpisodeDominick Vashon, the patriarch of the crime family, seeks revenge on McGarrett for killing his grandson, Chris, and sending his son, Honore, to prison. With help from his incarcerated son, he finds a man who has a grudge against McGarrett and asks him to kill McGarrett. He agrees and tries but McGarrett kills him first. When McGarrett goes to the body the gun the man had with him is gone and there are no signs of any bullets. John Manicote charges McGarrett with murder in the second degree. McGarrett hopes Harvey Drew, a lawyer who was with him, will testify to the shots that were fired. But he testifies that what he heard might not have been gun shots so Steve is indicted. Steve sees Dominick Vashon in the gallery and goes to talk to him. Afterward, McGarrett deduces Vashon sent the man to kill him. He needs to prove how the gun disappeared and why Harvey Drew lied.
- An off-duty police officer is shot and killed by a sniper while moonlighting as a funeral escort. The next day, another officer is shot and killed during a police standoff, but the bullets taken from his body and the body of the other murdered officer don't match the gun the suspect used. Another link between the two murders is a metallic plate with both officers' names engraved on it. A few days later someone takes a shot at McGarrett and during a high speed chase the suspect's car crashes into the harbor and he manages to escape and leaves behind a prosthetic hook. McGarrett soon realizes that the suspect in both murders as well as the attempt on his life is Curt Stoner, a bank robber who blamed them for the loss of his arms in a failed bank robbery attempt several years earlier. McGarrett then tries to warn another officer before he is killed but is too late. Now it is a race against time to find the killer before he completes his vendetta and kills McGarrett.
- A somewhat odd family comes to Hawaii and embarks on a criminal rampage. McGarrett can find no pattern to their activities until information from the mainland shows they rob and kill random targets without a second thought.
- 1968–198051mNot Rated8.5 (136)TV EpisodeDan Williams welcomes his Aunt Clara to Hawaii for a visit. On the flight over, she got to know Edgar Miller, an elderly man on the same flight. Once he checks into his hotel room, Miller encounters two attackers but not before he makes a telephone call to Clara. Five-O's Duke, investigating Clara's call, is initially taken in by an impostor pretending to be Miller. But Five-O, after the real Miller's body is discovered, begins an investigation. McGarrett & Co. utilize Clara as part of a con to bring the conspirators to justice.
- A psychotic young man is obsessed with the comic strip character "Judy Moon" and as a result of that obsession he murders three men who are dead ringers for villains that threaten "Judy" in the comic strip. Danny is then chosen to act as bait to flush the killer out. However, things become complicated when a young woman who resembles "Judy" is being stalked by the killer.
- Chris Vashon is male heir to the Vashon crime family, which now has considerable legitimate business holdings. The young Vashon, a rebellious sort, has been conducting robberies with friends. McGarrett sees the development as a way of striking back at the Vashons. However, Five-O discovers that's easier said than done, when Honare Vashon, Chris's father, bribes witnesses and Chris Vashon beats the rap in court. McGarrett doesn't give up and attempts to trap Chris Vashon again.
- 1968–198050mNot Rated8.3 (99)TV EpisodeSomeone breaks into Five-O's temporary offices at the Territorial Building and, for the most part, manages to avoid the burglar alarms. When the alarm is triggered, the guard who responds is decoyed by a small music-playing souvenir doll long enough for the burglar to escape. The next day, however, Five-O's staff can find nothing missing, even though there is evidence that the lock to one of the cabinets was picked. What was taken they only learn later -- a single sheet official requisition form that is used to steal about $14,000 in state money -- the first step in an elaborate scheme by a check forger whom McGarrett once helped put in jail.
- 1968–198051mNot Rated8.2 (164)TV EpisodeA cagey professor and the syndicate team up on a deadly caper. About $750,000 in traveler checks are stolen in Denver. A planeload of criminals posing as academics board a charter flight to Honolulu, with each given $7,500 in traveler checks to spend. A hit man ensures a woman employee of the Honolulu office of the traveler check company can't get the serial numbers of the hot checks circulated. McGarrett calls the caper a "jigsaw puzzle." The question is whether he can solve it in time.
- Wo Fat, disguised as an academic from Hong Kong, organizes the theft of deadly toxins on loan to the University of Hawaii for medical experiments. McGarrett travels to Hong Kong in pursuit of Wo Fat but is captured.
- When famed bank robber Lewis Avery Filer, whom McGarrett put away a year and a half ago, learns that a fellow con about to be released plans to resume his career as a drug dealer, he decides to get out on his own and infiltrate the drug gang. Filer plans to tail the drug dealer and relieve him of the $4 million he's received for cocaine shipments, through use of trickery and gadgetry. McGarrett tries to outwit Filer once again and recover the money before Filer can flee with it.
- Con-artists arrive in Hawaii and meet up with local thieves to plan a phony diamond con. When a wealthy tourist devastated by the con leaps to his death, McGarrett discovers he is one of many victims. As another angry victim seeking revenge and Five-O close in on the gang; the crooks turn on one another.
- McGarrett receives a telephone call when he arrives at his office. The caller says that he intends to kill someone. The caller has also sent the lawman a key that will identity the intended victim. The other Five-0 detectives have received taunts and clues from the caller, including a photograph of Chin Ho's garage, and a note in the trunk of Danno's car. The caller continues to taunt McGarrett, who is desperate to learn the identity of the caller, and the identity of the intended victim.
- Operatives working for Wo Fat steal a device from a U.S. military base in Hawaii. Wo Fat is also manipulating a young Maoist into helping him smuggle the device to China. McGarrett and Five-O race to keep the device from leaving the islands. They capture Wo Fat at the last minute. But McGarrett receives a shock courtesy of U.S. spymaster Jonathan Kaye.
- A psychiatrist is tormented by a man calling himself Cerberus. Cerberus claims he was rejected for treatment and is determined to take revenge by extorting the psychiatrist. Cerberus, to show he means business, begins harassing the psychiatrist's patients, including a young man dying of a brain tumor and a suicidal woman. McGarrett & the Five-O must deal with this cunning and ruthless adversary.
- "Respectable" Japanese-American businessmen come upon former WWII POWs who recognize their tormentors. In this case, three men reunite at the Ilikai Hotel in Honolulu 25 years after they were liberated from a Philippine prison camp. One of the three is relatively healthy, but another drags himself on crutches with a hopelessly mangled leg and the third suffered a permanent brain injury. The man on crutches spots a businessman, calls him by a very different name and wallops him over the head with the crutches. The name the man utters is that of the prison-camp commandant, who selectively tortured the three men. Soon, things begin to escalate. First, the Japanese businessman is trapped in his car with a time bomb ticking down in the engine. Five-O is on the scene and gets him out in the nick of time. The police figure out the bomb plant was part of a plot to terrorize him. But then a sharpshooter blazes away at the businessman and the brain-addled third former POW, who has been tormented at being unable to protect his two comrades. The third prisoner soon finds eternal peace, but the second former POW is arrested after the rifle is found in his room and he cannot explain why. So who is behind it all?
- Three college football players, one the son of a powerful senator, rape a waitress. The senator sends his "fixer," a lawyer working for him, to take care of the situation. The fixer finds a petty criminal willing to be a patsy in return for $5,000 and a guarantee that charges won't be pressed against him. Five-O tries to find out what really happened. Meanwhile, the victim moves to take matters into her own hands.
- U.S. Commander Nicholson now has the perfect counterfeit plates. His price: $2 million and amnesty for all crimes (including the murder of the man he got the plates from). His girlfriend, Nicole Fleming, is playing the Chinese and Soviets off each other before striking a $3 million deal for herself with Wo Fat. McGarrett and Five-O are running out of time to recover the plates.
- A rogue IRS agent on the trail of a tax evader catches him in an airplane lavatory - and strangles him. The agent's real motive for the murder was to find and keep $600,000 the dead man was carrying in a suitcase. Then the suitcase is mistakenly picked up at Honolulu Airport by a flight attendant. The agent tracks her down and murders her as well, but once again it's the wrong suitcase. Two mainland tourists have the money and the IRS agent - who has joined Five-O as a special agent on the trail of the hot money - uses the police resources to go after them.
- Steve and the team are looking for the man who is sexually assaulting and killing women. He's killed four and there are no leads. His latest victim doesn't die but is unwilling to help. Steve knows that a couple of the victims were having problems with their cars so he places policewomen in position and to await him to make his move. But when a cop approaches one of them, she tells him that she's on a stakeout so he leaves. But when they realize the cop is the one they are looking for because the victims either went with him in his car or allowed him to enter their homes willingly. So he tries to find out who he is. He later suspects it could be a guy who failed to be accepted on the force.
- 1968–198051mNot Rated8.1 (138)TV EpisodeA notorious thief is sprung from prison by a criminal gang who wants him to teach them how to rob a diamond exchange and escape undetected. The thief obliges, but McGarrett and Danno are puzzled when the thief -- who ought to be hiding as deep as possible -- is spotted at a drugstore and at a marina.
- 1968–198050mNot Rated8.0 (129)TV EpisodeFive-O matches wits with a brilliant thief who's a master of disguise and able to manufacture his own pass keys to Honolulu hotels. The thief has information on guests with valuables and how they try to hide them in their rooms. He even calls the police while disguised as a priest claiming to be robbed himself. The question is whether McGarrett & Co. can catch up to the thief.
- Wo Fat brings in an assassin to kill a man who made a tour of Communist China and got a good look at its nuclear facilities. The spy freaks out and runs just before the sniper pulls the trigger, and it takes three shots to bring him down. When the man is still alive with a bullet next to his brain, Wo Fat and his goons contact the top neurosurgeon in Hawaii with a "request" to ensure the spy dies on the operating table. To ensure his "cooperation", the goons kidnap the doctor's daughter and hold her on a boat. McGarrett and a Federal agent embark on an elaborate case of counter-espionage to trick Wo Fat into going back to Peking and getting the Party bosses to tear down their nuclear reactors -- and to find the girl, her kidnappers and the mole who tipped off Wo Fat in the first place.
- The Chinese (led by Wo Fat), the Soviets (led by Mischa Toptegan) and assorted criminals are all after perfect counterfeit plates. The plates were originally developed by the Chinese, who want to use them to flood international markets with phony U.S. currency and destroy the American economy. Jonathan Kaye enlists Five-O's help to track down the plates and a Navy intelligence officer, and a friend of McGarrett's, also is part of the probe. However, the Navy man is secretly working with Nicole Fleming, one of the criminals after the plates.
- Mobster Charlie Bombay, an old foe of McGarrett's, escapes from prison, thanks to a bribed guard. But Bombay's confederates tip Five-O to Bombay's whereabouts before Charlie can flee Hawaii. McGarrett arrests Bombay in Hilo, thanks to the tip and wants to take the criminal back to prison personally. But the small police airplane containing McGarrett and Bombay crashes because of turbulent weather. The pilot is killed in the crash and Bombay overpowers an injured McGarrett.
- The U.S. Navy's top "spy catcher" is killed by a powerful letter bomb while in Honolulu. Five-O's Steve McGarrett, while serving a two-week hitch in the Navy Reserves, is called upon to investigate the slaying. The death is tied to a security leak within Naval Intelligence and it turns out that Wo Fat is its mastermind.
- A deadly strain of heroin hits the island.
- Red Chinese agent Wo Fat uses a sensory deprivation chamber to procure information from U.S. agents. McGarrett, head of Hawaii's state police force, poses as "control," possessor of the names of other agents. He allows himself to be captured and placed in the chamber; will he be able to withstand the torture?
- Al Harrington's first episode as Ben also introduces Duke Lukela and John Manicote as semi-regulars. Manicote launches an investigation of Five-O when Duke, an HPD sergeant who sometimes joins Five-O on investigations, is accused of being on the take. McGarrett does what would be now called an intensive database search, with numerous records on all Five-O team members transferred to projection slides and put up on the screen (if you can freeze-frame or slow your player to catch all of them, there is a wealth of information on the characters -- including McGarrett's birthday, which is in the wrong month!). Convinced that Duke was set up by someone, McGarrett repeats the process with members of Manicote's office and finds that one of the Assistant District Attorneys is a mole planted long before by the mob to discredit the office. Guest star Michael Ansara, playing the mob boss, forsakes his toupee (he's shown swimming) and is very bald.
- McGarrett joins a group of operatives trying to take down a major drug lab in the hills. The raid succeeds, but a young man smashes through a cordon in a truck and escapes. Word of the raid soon reaches a retired HPD cop, who realizes the escapee is his own son. The cop starts sneaking into evidence rooms and destroying or stealing anything which can implicate the son. Meanwhile, the son is still working as a drug dealer and holes up in another lab used to make methamphetamine. The title of this show is to be taken literally.
- A nerdy bookstore clerk with an obsession for McGarrett turns deadly as he re-creates some of Five-O's most famous cases that were covered in a series of magazine articles. He is so brazen that he even calls McGarrett to brag about his crimes and sends him notes. Now McGarrett and the rest of the Five-O team must find the killer before he strikes again.
- 1968–198050mNot Rated7.9 (176)TV EpisodeThe Lovejoys, a family of grifters, make a bigger score than they ever imagined. The problem is they've ripped off a mobster who wants his money back -- and will gladly kill to do so.
- A young woman is savagely beaten and raped outside a bar. The prime suspect is a bald headed soldier, with whom she was seen arguing inside the bar. The jury eventually convicts him based on the eyewitness testimony of a young mechanic who was at the bar that night. However, when his medical report comes back McGarrett begins to have doubts about whether or not he did it.
- Norman Cargill, an old friend of McGarrett who has provided help in authenticating documents, is sick (he is going blind) and tired (of walking the straight and narrow for crumbs). When asked to verify a shipment of highly valuable bonds, he agrees and carefully starts copying them by hand to create bonds which he can keep and redeem himself. Cargill kills two people who are aware of his doings. McGarrett reluctantly orders surveillance on Cargill who indignantly protests. McGarrett, who doesn't yet know for sure if Cargill is a killer, calls off the surveillance. However, the evidence he already has in hand forces him investigate Cargill for murder.
- A paranoid Korean War veteran, thinking a policeman is about to arrest him for a crime he didn't commit, grabs the officer's gun and shoots him. More cops appear, so the vet pulls the wounded officer's ammunition belt free and runs into an apartment occupied by a teenage girl, locking himself and the girl inside. McGarrett and HPD's SWAT team arrive at the same time, and the leader of the SWAT team wants to blast his way into the apartment and take down the gunman, who blazes away at targets all over the place. Because somehow the gunman hasn't killed anybody yet, and because McGarrett thinks the gunman might be better off in a mental hospital, McGarrett butts heads with the HPD officer and stalls to buy time to negotiate a peaceful surrender -- although the media circus surrounding the hostage situation immensely complicates the negotiation.
- 1968–198051mNot Rated7.9 (131)TV EpisodeMcGarrett is found in an upside-down car containing a dead crime lord and a briefcase with thousands of dollars. Each step of the frame is perfect and unbreakable. McGarrett figures only man can be responsible -- Wo Fat. Indeed, the Chinese intelligence operative has just arrived in Hawaii. It turns out Wo Fat arranged for a man to undergo many plastic surgery operations to look exactly like McGarrett. The man is caught and fatally wounded as he tries to withdraw money from a Swiss bank. Before he dies, the double says, "Wo Fat bought my soul for 90 seconds."
- The young son of a rich man is kidnapped. Five-O and HPD observe the scene where the kidnappers are to pick up the money. Five-O's Kono corners the kidnappers but ends up being captured. He sets the boy free but is beaten by the kidnappers, who now are demanding ransom for release of the Five-O member.
- A retired chemical engineer, after fighting City Hall and the state government over the proposed demolition of his housing complex for the elderly, wears a bomb into a Jimmy Borges concert and demands that the Governor cut through the red tape -- but doesn't count on the psycho girlfriend of a mobster about to be shipped to the mainland crashing the party and taking HIM hostage. This episode features Richard Denning in a larger-than-usual role and is the only acting role for director Sutton Roley, who appears at the beginning as the judge signing the extradition order.
- At a birthday party, the guest of honor suddenly suffocates after getting a card saying this is his last birthday. The dead man is one of three partners in a shady real estate business with a reputation for swindling its customers. Five-O's investigation intensifies after a second partner gets a similar threat. When the second partner turns up dead, McGarrett knows he is running out of time to solve the case.
- The series pilot, which originally aired as a two-hour TV movie, is re-edited as a two-part episode of the series. In the opening installment, a U.S. intelligent agent, a friend of McGarrett's, turns up dead on a Honolulu beach. McGarrett, knowing the man didn't swim, decides to investigate the death as a homicide. Five-O gets no cooperation from the Feds, making McGarrett suspicious. His probe eventually leads to a mysterious ship, which is in dock for repairs. Going undercover as a member of a repair crew, McGarrett discovers a futuristic-looking chamber.
- A computer expert is hired to program various machines to produce phony evidence to influence a trial.
- Three seemingly ordinary people are recruited to make a hit on a mob boss from Chicago visiting Hawaii. The hit is done with precision. The killers are equipped with firearms with plastic coverings that prevent shell casings from being left for evidence, for example. Also, the three participants, in effect, provide alibis for each other. Five-O initially thinks this is a professional hit until its probe begins to uncover the truth. McGarrett & Co. must figure out why these three people were so desperate they could be blackmailed into performing a murder. Second, Five-O must figure out what the ultimate goal of the caper is.
- 1968–198051mNot Rated7.8 (136)TV EpisodeA convicted murderer escapes prison. He has been threatening a woman, spurring McGarrett to arrive at the woman's home with police officers. As the lawman arrives, the convict calls, telling the woman he will kill her by nightfall. While McGarrett guards the woman, he also probes to find out more about the circumstances that led to the man's conviction. It's clear that McGarrett believes there's more to the case than she has been telling.
- Alex Kelsey, a lawyer involved with mobster Din Lee, kills a dying Japanese man. The dead man had been a Japanese operative at the time of Pearl Harbor. Kelsey believes the dead man had a secret stash of gold. Kazuo Tahashi, the dead man's son, arrives from San Francisco. But Tahashi isn't all what he appears to be, either. Meanwhile, in the background is retired U.S. Navy Commander Reginald Blackwell, who had been an operative in Naval intelligence. McGarrett & Co. must try to put the pieces of this jigsaw puzzle together.
- A young man in Oahu State Prison has been a model prisoner and is let out on parole. A few days later, he appears in Five-O headquarters at the Iolani Palace, taking prisoners and demanding that Dan Williams be brought to him. All of this is transpiring while McGarrett is on the Mainland. Danno has no idea why the man wants him dead. It is not until Williams enters the trap that he discovers the man is the brother of a man the lawman killed in season one's "...And They Painted Daisies on His Coffin."
- A series of arson fires has Honolulu on edge. Each fire occurs on Sunday and despite patrols by Hawaii Five-O and HPD, authorities haven't been able to catch the arsonist. So far, no one has been injured. It turns out the fires are part of a plan by a businessman who is going to have his own company burned down so he can collect the insurance money. The earlier blazes were to establish "the Sunday Torch" M.O. and to find a suitable dupe.
- A plane arrives in Hawaii with 300 passengers aboard, including a tour group of 40. After everyone has left the plane, however, a stewardess discovers that one remaining passenger is dead, the victim of a stabbing with a thin instrument of some kind. Then a woman is discovered dead in a tropical park with a similar wound. Because the victim on the plane turns out to have been a CIA agent, McGarrett contacts Jonathan Kaye in Washington, and learns that the killer may be a mysterious hit man known only as "Raymond." With little information about either the killer or his intended victim, McGarrett assigns officer Sandi Welles (seen in the previous season's "Loose Ends Get Hit") to go undercover as a guide with the tour group from the plane, hoping that she can discover something.
- 1968–198051mNot Rated7.8 (220)TV EpisodeMcGarrett is gunned down during his morning run on the beach. While the lawman is in critical condition, Dan Williams leads the investigation. Shortly thereafter, another man is killed and Five-O probes whether the two incidents are related. It turns out they are -- and the state Attorney General may become the next victim.
- An assistant district attorney is killed when he finds a ''box man'' i.e. safecracker rifling through the attorney's office on a Sunday. The assistant DA was preparing to prosecute Matsukino, a local mobster. The key piece of evidence, a handgun, is now missing. McGarrett brings in Matsukino and his right-hand man, Cardonus. McGarrett does a bit of psychological game playing by letting Matsukino go and keeping Cardonus in the lawman's office. The Five-O leader reminds Cardonus that Matsukino doesn't like to leave loose ends. After Cardonus is released, his car blows up. Cardonus, knowing that Matsukino wants him dead, goes to Five-O. McGarrett wants Cardonus to testify at the upcoming trial. The question is whether Five-O can keep Cardonus alive to make the court date.
- 1968–198050mNot Rated7.7 (136)TV EpisodeHobbs, a miner from the Australian Outback, comes to Hawaii to sell opals he has dug up. Hobbs' secret is that he is actually carrying a much larger and immensely more valuable cache, which he smuggled through customs after showing them his display items. When he negotiates with a jeweler, a robber bursts in and steals all of the gems. Hobbs tells Five-O about the theft of his small items, leaving out the bigger picture. He suspects (correctly) that the robbery was an inside job pulled off by associates of the jewelry-store owner. Hobbs finds the holdup man and kills him, only to find out that the jewels in the man's possession aren't Hobbs'. He launches a violent quest to find the top-grade jewels before Five-O does.
- A gang, led by the vicious Hawkins, is executing a plot to steal $6 million. The group includes a bank employee and an alienated, long-time employee of a trucking company. The plan results in multiple deaths. Dan Williams leads the Five-O investigation because McGarrett is having to testify at a trial on the "Big Island."
- 1968–198051mNot Rated7.7 (189)TV EpisodeWo Fat returns. His men break into a center and send out a false tsunami warning. This provides cover so other of his operatives can kidnap a scientist. However, it turns out the scientist is a diabetic who requires insulin shots. This complicates Wo Fat's plans to remove the scientist from Hawaii. Five-O races to prevent Wo Fat from succeeding.
- Five-O investigates multiple cases of missing women tourists. The victims were all recently widowed. It turns out that they are being seduced, swindled and then murdered. Five-O sets up an undercover operation in which a Honolulu Police Department woman officer will serve as bait. The culprits are a married couple. He seduces the victims, she pretends to be his sister.
- The No. 2 executive to a reclusive businessman approaches McGarrett. He tells the lawman that he has evidence of illegal activity by his employer. But the executive insists on elaborate procedures for a more detailed meeting, including having McGarrett attend unarmed. The Governor insists that Danny Williams attend in McGarrett's place. While their meeting occurs, the executive also shows up and kills the chief executive of the company. Now, Danno is the executive's alibi.
- Thugs break into the heavily-guarded art room of a multimillionaire and steal a Gauguin painting worth a fortune. When Five-O comes to investigate, the millionaire, his secretary and his grandson (who are the only inhabitants of the mansion) are surprisingly uncooperative. It turns out that the old man had been planning to sell the painting and had hired two art appraisers to market it. Soon, the group receives a ransom demand. The grandson figures out a way to pay the ransom despite intense Five-O surveillance -- with grandfather, grandson and secretary all leaving to "drop off" the $250,000, leading Five-O members on a wild goose chase, and arriving at the Iolani Palace at the exact same moment. The art appraiser, who wasn't under surveillance, paid the money and got the painting back himself. This bit of mass nose-thumbing really doesn't go over well with McGarrett, who suspects the grandson of stealing the painting to get the ransom money for his own lavish lifestyle. All is not what it seems, however. When the appraisers look over the returned painting and pronounce it genuine, the grandson promptly says it's a fake. How does he know? In a roughhousing bout with a buddy, he fell onto the real painting and damaged it. That means the real painting was stolen long before; the burglary was an elaborate scheme to steal a forgery. The grandson figures out immediately who was behind the theft of the painting (and the ransom money, presumably split among the thieves and their hired burglars), but is murdered before he can tell Five-O. McGarrett knows the appraisers did the dirty work, but has no way of charging them unless somehow he can find the real painting in their hands.
- A vicious law-and-order zealot becomes inflamed by various thugs getting off the hook in court on technicalities. So, using an alias, the man sends a letter to McGarrett promising to blow away the next criminal who takes a walk -- naming a specific hood in particular. The criminal walks and is drilled right in front of the courthouse. As a public debate rages on vigilante "justice," the killer sends McGarrett another note, expanding his hate list to the judges who order charges quashed on technicalities. A judge (Frank Cady of Hooterville fame in a very rare serious role) does just that and is promptly kidnapped from the courthouse by the zealot. McGarrett must pretend to appease the zealot while tracking him down.
- McGarrett's sister, whose infant son is dying of cancer, has fallen under the sway of a medical quack. Her husband is afraid to confront her. Instead, he summons McGarrett to their home in Los Angeles. McGarrett enlists the aid of U.S. Food and Drug Administration officials in prosecuting the quack. However, McGarrett's sister refuses to believe her big brother. When the child dies, the sister turns against McGarrett. As the trial begins, it is disrupted by followers of the quack.
- McGarrett, desperate to convict medical quack C.L. Fremont, seeks evidence where she can be prosecuted for a more serious charge. Facing extremely long odds, he convinces the family of a former Fremont patient to have the body exhumed. However, the casket wasn't airtight. McGarrett and Zipser, an attorney for the U.S. Food and Drug Administration, instead manage to trip up Fremont in court. The maneuver causes McGarrett's sister to realize her brother had been right all along.
- A disturbed ex-GI who was dishonorably discharged and then tried to re-enlist under a false name takes revenge at the Military by murdering officer's wives who fly to Hawaii expecting to meet their husbands on R&R from Vietnam.
- After a young woman has died from a drug overdose, Johnny Kling moves to avenge the death by killing those who sold and distributed the drugs. Kling performs the killings in such a way to evoke scenes from old movies. For his final target, he intends to copy the explosive ending from "White Heat."
- A man arrives on a plane in Maui, and is reunited with his girlfriend. When they get home, another man is seen approaching their home in a suspicious manner. A shootout occurs, leaving the suspicious man dead. The two lovers go on the run. They are pursued by a mobster who had killed a man in the presence of the woman.
- While flying her brother's hang glider over Makapuu, Molly Taggart witnesses a friend's murder by a pair of local low life thugs. Realizing that their crime was seen from the air, the thugs set out to kill the glider's pilot.
- A powerful cattle Baron has taken the law into his own hands when his son is killed outside a bar.
- 1968–198050mNot Rated7.7 (128)TV EpisodeFive-O investigates a company that promises heirs an early payout from the wills of rich, elderly relatives. The company has been taken over by new owners in recent years and a trail of abrupt deaths has developed. McGarrett recruits a lawyer to go undercover as a high-living heir as Five-O seeks to end the killings.
- 1968–198050mNot Rated7.7 (166)TV EpisodeA sophisticated operation is blackmailing rich and prominent visitors to Hawaii. One of the victims has told Tolliver, a private investigator, about his situation. Tolliver tells his friend that he'll work to get him free of the blackmailers. Meanwhile, a young woman has turned up dead -- which brings Five-O into the case. It turns out she was among numerous women used as bait, but she has become too hot to handle when one of the blackmail victims committed suicide. Tolliver, meanwhile, poses as a rich man to attract the attention of the blackmailers. But he has no intention of ruining the operation. Tolliver intends to take it over.
- An American drug smuggler, who faces death by hanging if arrested by Singapore authorities, escapes McGarrett's grip quite literally by sliding along a tram car cable, then fleeing to one of the tiny islands that surround the main island. A Malay drug lord, stiffed by the American, wants his scalp and kidnaps his wife to force him to come out into the open. The drug lord permits McGarrett to board his boat and to take the wife (who has been forced to ingest cocaine and will soon die if she doesn't get medical help) to a hospital in return for her husband facing death by a bullet. The American, now on the lam, agrees, but secretly instructs his goon squad to create a diversion while he pulls off the ultimate double-cross.
- Chin goes undercover to investigate a protection racket. But when he's recognized, the leader kills him and dumps his body at the Iolani Palace. Steve sets out to get the one who killed him. He brings in the head of the organization behind the protection racket and asks for his help. He refuses. Chin's daughter arrives and Steve tells her what happened. It turns out that she knows the daughter of the head of the organization and uses her relationship with her to see if she can find out who killed her father.
- A plaque, an award for his work in law enforcement, arrives in McGarrett's office and promptly explodes, killing one officer and injuring McGarrett. The perpetrator soon discovers McGarrett survived and begins planning his next attempt.
- 1968–198051mNot Rated7.6 (207)TV EpisodeIn a show with several similarities to the previous season opener, a series of swindlings are covers for serial murder. An Army sergeant who lost his brother in Vietnam because of the latter's infatuation with a bar girl, uses Honolulu bar girls as patsies to "marry" dead soldiers and collect on their $10,000 apiece insurance policies -- then murders them and keeps the money. The sergeant is absolutely coldblooded and utters the episode's title when his partner (who has been forging the marriage certificates and the insurance papers) has a heart attack and can't get to his nitro tablets. An unusually violent ending. From this point, all series closing credits are played over shots of men paddling an outrigger canoe through the ocean (replacing the first-season end title of a flashing police light on a car driving through Honolulu); the color and size of the credit cards is also altered.
- A state investigation centers on Mike Finney, a former racketeer who hasn't violated the law since moving to Hawaii nine years earlier. But Charles Irwin, an ambitious counsel for a state legislative committee, sees the probe as a way to further his political ambitions. For Five-O, the case begins when there is an apparent attempt on Irwin's life. McGarrett, who knows Finney, is also a target of Irwin. Meanwhile, the "syndicate" on the mainland, nervous that Finney is being investigated, sends a hitman to Hawaii to kill Finney.
- 1968–198051mNot Rated7.6 (161)TV EpisodeA mentally disturbed former soldier buys a new rifle and ammunition after a sales clerk fails to check him out. The soldier even signs his name as "George C. Patton." He then holes up in a spot on Diamond Head and shoots out the tires of a motorist's car and proceeds to shoot two police officers, one fatally. McGarrett coordinates the police response. The more McGarrett finds out, the worse it gets. It turns out the sniper has a weird relationship with his mother. The mother, in turn, denies the former soldier is her son. Time is running out and Five-O must prepare to lead a police assault on the sniper.
- McGarrett survives a bombing of his car but is blinded. His sight may or may not return. He begins rehabilitation under the no-nonsense supervision of Nurse Lavallo. Five-O's investigation fails to turn up a suspect among known criminals. Meanwhile, McGarrett's attacker is determined the kill the lawman in the hospital where he is undergoing rehabilitation.
- Officer Sandi Welles has a younger brother Mike, of whom she is VERY protective. This is with good reason, as Mike is a chronic gambler fighting a losing battle with addiction and heavily in debt. Mike sneaks into an illegal casino which is then raided by the police. As Mike flees on foot, he is stopped by a police sergeant. A mobster fleeing the scene in his car runs over the police sergeant, who is fatally injured. Mike runs away as McGarrett and his team arrive on the scene. Mike does not want to let Sandi know that he has relapsed into his old gambling habits, so he contacts the mobster and demands hush money to cover his debts. The mobster agrees, but then goes after Mike to silence him.
- Glenn Cannon's final episode as Attorney General John Manicote gives him a major role as his daughter disappears into a rain forest on the windward side of Oahu, just as a maniacal serial killer breaks the prison van and heads into the same area with a shotgun.
- Five-O seeks to bust a family-run protection racket. But the investigation turns personal for Five-O stalwart Chin Ho Kelly because his daughter is in love with the son of the racket's patriarch. The probe intensifies after a policeman and the best friend of Chin Ho's daughter are killed. On top of that, the lovers wed.
- A private detective, and former HPD officer, turns up dead. Following his trail, Five-O discovers the private detective was investigating whether a businessman's son-in-law was being faithful in his marriage. It turns out the son-in-law is up to his neck in a scheme to steal gold from the businessman, melt it and recast it and make it appear to be a treasure find. Things will turn more deadly before Five-O can crack the case.
- Five-O races to find the witness to a hit on a bagman of a local mob. The witness, who narrowly escaped being killed himself, had dropped a library book with his library card inside, providing the hitman with the name of the witness. The witness's wife doesn't want him to go to the police. Five-O's main clue is a letter the witness wrote to the Honolulu Star-Bulletin's "Secret Witness" feature that seeks tips for unsolved crimes.
- A sniper targets police officers.
- The wife of a wealthy doctor is shot to death. The physician seems to have a tight alibi while clues point to another man. But the more Five-O probes, the more the obvious turns out not to be. The suspect is arrested while trying to fence the dead woman's jewelry. But he was dying and had little motive to kill the woman. McGarrett & Co. need to dig deeper to find the truth.
- A prison lifer working in the infirmary as an orderly gets the shock of his life when a dying fellow inmate confesses that he himself committed the murder that the orderly, a businessman on the outside, was convicted of three years earlier. Nobody else heard the confession, and there is no evidence tying the now-dead hit man to the murder. The orderly freaks out and grabs a guard's riot shotgun, tapes it to the throat of the prison doctor and sends out the word -- reopen his case and find the person who ordered the hit, or get the doctor's head on a plate. Skeptical at first, McGarrett soon finds evidence that contradicts statements made at the businessman's trial and renders his "motive" for the murder meaningless. He still doesn't know who could have ordered the hit, though. A professional colleague of suspect, victim and the suspect's lawyer is found to have perjured at the trial -- coached by the lawyer, who DID order the hit. The lawyer's two hired thugs waste the colleague in traffic as he goes to talk to McGarrett, then go after the colleague's wife. The scene switches back to the infirmary, where the doctor persuades the increasingly sleepy convict to cut the tape holding the shotgun, in case it goes off accidentally. The doctor, though, believes the convict's story and refuses to alert guards that he's cut the other half of the tape while the convict was sleeping and now has the shotgun in his own hands. McGarrett, still lacking a firm case, tries to find the business partner's wife -- the last possible witness -- before the lawyer and his thugs do.
- Murdock, an embittered businessman, concocts an elaborate robbery to gain the millions of dollars he needs for a pet business project. Murdock, though, has underestimated the ruthlessness of the men he has hired -- two people are killed before the robbery even takes place. McGarrett is determined to crack the complicated case.
- A honeymooner is murdered during a rigged game of poker and his brother arrives in Hawaii for revenge.
- A band of young radicals is killing ordinary people at random. Five-O consults an academic who is knowledgeable about such groups. The group then kidnaps Dan Williams and the academic, threatening to kill both men.
- A member of a Northern Irish splinter terrorist group disguises himself as a priest in order to buy weapons and bombs in Hawaii. He meets a gullible Catholic United Ireland supporter and uses her as a pawn to finance his buys and witness his murder of the supplier, all the while muttering platitudes in her ear to conceal the fact that his group has been disavowed by the IRA and is dedicated to causing as much mayhem in Northern Ireland as possible -- such as blowing up a school bus full of children.
- Ossie Connors, a brilliant and ruthless bank robber, devises a complicated scheme to get revenge on McGarrett, who put the criminal away 10 years earlier in what the lawman describes as "my first big arrest." Connors bribes a Five-O snitch to mislead Dan Williams, then has the snitch killed. Before the tale ends, three more people will lose their lives. McGarrett, relying on cop's instinct, resists what appears to be an easy end to the case.
- August March, a seemingly respectable businessman who is also an art collector, has been running a smuggling ring of Asian art. When he discovers McGarrett is also a collector of small Asian sculptures, March arranges for a stolen piece of art from Japan to be substituted for McGarrett's collection, which is about to go on display in a Honolulu museum. March sees this an opportunity to frame the lawman who could smash his operation. But McGarrett, despite all odds, moves to trap his opponent.
- McGarrett goes to the Governor with news of what he's uncovered in his investigation. The two agree the matter is too big for any state or local law-enforcement agency. The Governor contacts Jonathan Kaye, who oversees U.S. intelligence activity in the Pacific Rim. Kaye recruits McGarrett as part of a risky operation. The lawman will be programmed to impart false information under interrogation -- and U.S. intelligence will leak word that McGarrett knows the identity of "Control," the man who has direct supervision of U.S. agents in the region. McGarrett, as planned, is captured and subjected to Wo Fat's "cocoon." He also uncovers the traitor who has been helping Wo Fat.
- A criminal syndicate has stolen 6,000 airline, cruise and attraction tickets and is now shoving them down the throats of travel agencies, forcing them to pay for them and then "eat" them to avoid taking the blame for stealing stolen merchandise. To make sure the travel agencies stay in line, one of them is bombed, killing three people. An undercover agent from the mainland helps Five-O infiltrate the gang. The only chance you will get to see similarly-named actors Jack Hogan (who gets top billing because he was a regular on "Sierra" at the time of filming; he plays the gang's main enforcer) and Jack Kosslyn (as the Federal agent) at the same time, and one of the few times Kwan Hi Lim (as the gang boss) get guest-star billing. Features an incredibly wild chase where McGarrett, in a car driving along the edge of a canal, ducks bullets from Hogan's character in a speedboat (and they drive to one end of the canal and back up the other).
- A young woman goes onto a balcony in what is thought to be a suicide attempt. However, it is all a plot to lure her fiancée out into the open to kill him and prevent him from testifying against a mobster. After he has been liquidated, McGarrett must now try to prevent the woman from becoming the gang's next victim.
- Greggs, a land developer, has a zoning man, Huffman, in his pocket. As Huffman has started offering his services to other developers, 5-0 has built a case against him. Greggs, knowing that Huffman will turn on him to save himself, calls him telling him to meet him. Greggs sends one of his men, Koa, to kill Huffman. Koa was about to leave when a car drives off. A filmmaker had seen Huffman's car and taken the dead man's wallet but dropped one of his film cans. Koa finds it and gives it to Greggs, who has it developed and sees that it is footage of the area near the murder. He sends one of his men to find the filmmaker based on the info from the dropped film can. McGarrett, on learning of Huffman's death, investigates. He sends Danny Williams to pick him up but Koa resists. Koa is arrested for assaulting Danny. While trying to gather more evidence, the Five-0 learn that the late Huffman's credit cards are being used so they try to find the ones using them, the filmmaker and his buddy, before the two young men are killed.
- The slaying of a public health official while conducting an investigation into venereal disease leads McGarrett into the world of politics and intrigue. Starting with an appointment list of the slain official, McGarrett works his way up to a meeting with a highly respected candidate for public office.
- A dying man is discovered on a beach. A mysterious motorcycle rider takes the man's identification and speeds off. The man has bubonic plague. Five-O races to contain a potential plague outbreak and discover what the motorcycle rider is doing. McGarrett & Co. uncover a plot by a Chinese operative to steal a U.S. night-vision device under development at a U.S. military base in Hawaii.
- 1968–198051mNot Rated7.5 (151)TV EpisodeTwo skeletons, a man and a woman killed ten years ago, are discovered. One of them comprise the remains of the former right-hand man of Mondrago, a prominent businessman. McGarrett concludes Mondrago is hiding something and may have killed his late wife and his former business associate. Mondrago is indeed hiding something, but not what it seems. The key to the mystery is Mondrago's daughter, who looks just like her late mother.
- Five-O and District Attorney John Manicote think they have an ironclad case against a mobster on trial. But the jury keeps coming back with news that they have not reached a verdict. The judge refuses to reveal the vote, but McGarrett correctly suspects that one person is holding out for an acquittal. But who - and why? Five-O obtains a jury list and starts checking out all of them to see who could have been bought, blackmailed or threatened.
- McGarrett and Williams board a cruise ship to find a man involved in a fatal shooting at a bank.
- Honolulu policeman Lew Morgan appears to be cracking after his wife is killed. Morgan also is an old friend of Five-O's Dan Williams, who takes a personal interest in the case. It turns out that Morgan's wife, Marjorie, had affairs with other men. The lead suspect is Gary Oliver, a criminal who was Mrs. Morgan's latest lover. Morgan kills Oliver, an apparent case of a grief-stricken husband taking vengeance. But Five-O's probe shows the case is more complicated.
- The Hawaiian "kumu" mob, first introduced in "A Death in the Family" (episode #10.24) returns with a new boss named Tony Alika (Ross Martin), and their first order of business is to kill the head of the Hawaiian music mafia and muscle in on a promising new singer, played by real-life singing star Yvonne Elliman.
- Jimmy O'Hara, co-owner of a travel agency with ex-bookie Sam Green, is beaten to death by thugs with brass knuckles. Green organizes gambling junkets, which is draining revenue from a hood's gambling rackets. What's more, one of Green's customers refuses to make good on $120,000 in losses on a junket in Seoul. Green is being squeezed hard by the Hawaiian gangster and the Korean gambling house. Five-O's investigation becomes complicated after the losing gambler turns up dead; the loser was also having an affair with the wife of another customer on the Korean gambling junket.
- During a traffic stop in the boonies, the driver slips out a concealed handgun and shoots the HPD officer down in his tracks. Before dying, the cop gets off a couple of rounds at the fleeing car, causing it to crash. McGarrett and Danno visit the killer in the hospital, where he still couldn't care less about murdering a man ("I chopped a cop ... put a pig in a blanket"). The incident preys heavily on both men's minds, particularly Danno's. Later that same night, Danno witnesses a liquor-store robbery where the masked thief takes a shot at him. Danno follows the thief to a house, but loses him on the grounds. When a person steps out appearing to be carrying a pistol, Danno fires -- and finds to his horror that the young man was an innocent kid living at the house -- carrying a soldering iron. As the wounded boy lingers comatose and in critical condition, McGarrett must try to save Danno's reputation by proving that the robbery did occur and that the robber tricked the shooting victim into walking into the line of fire.
- 1968–198051mNot Rated7.5 (214)TV EpisodeA young woman student from Indonesia is killed at an educational institute. Footprints at the crime scene indicate a large man was present. Five-O comes up with two suspects: her American boyfriend and a mentally challenged man, Benny Apa. Neither case is airtight. The boyfriend had an argument with the dead woman shortly before she died. Benny Apa confesses to the killing but McGarrett can't be sure if he knows what he is saying.
- Colby runs an operation that fences stolen goods with retailers enticed by too-good-to-be-true prices. Five-O enters the case when the body of a federal law-enforcement agent -- killed during a robbery on the Mainland -- is discovered in a refrigerator shipped to Hawaii. McGarrett & Co. turn up the heat as the body count increases.
- A federal agent is murdered on a plane bound for Hawaii. The investigation of this crime leads McGarrett and Five-O to uncover a terrorist plot by Dr. Erich Stoss to distribute a fungus that will wipe out the Hawaiian sugar cane crop, thereby destroying an industry and thereby forcing the U.S. and other countries to buy sugar from non-U.S. sources.
- After being denied parole from prison, crime lord Honore Vashon comes up with a twisted scheme to exact revenge on McGarrett for the deaths of his son Chris and his father Dominick by taking a group of prison officials hostage. He then exchanges the officials for McGarrett and then places McGarrett on a mock trial for the alleged crimes he committed against the Vaschon family. Can Danny and the rest of the Five-O team save Steve before Vaschon sentences McGarrett?
- A spy ring targets a U.S. missile project headed by Dr. Grant Ormsbee, a headstrong scientist. The bait is an agent posing as an Asian scientist Orsmbee had met 12 years previously and who had maintained correspondence with Ormsbee. McGarrett clashes with Ormsbee initially when the scientist refuses to cooperate with Five-O's investigation of the death of a member of the spy ring, who has been sacrificed as part of the group's complicated plot. Ormsbee eventually agrees to play Judas Goat himself as Five-O and Naval Intelligence attempt to smash the spy ring.
- A music-loving rookie cop frequents a record store next to a bank. What he doesn't know is that the music-store owner and three henchmen are tunneling into the bank through a shared basement. After one of the thugs is killed in a cave-in, the remaining thieves "invite" the cop to a party where an old friend is busy making book via telephone, and then call HPD to bust the cop on departmental corruption charges to get him out of the way. McGarrett goes to bat for the cop against a relentless Internal Affairs captain, and is clued in to the bank heist after one of the thugs kills a potential informant.
- 1968–198051mNot Rated7.5 (183)TV EpisodeJo Louise, a rich and spoiled heiress, is recklessly pitting two suitors, Craig and Billy, against each other. She's devised a game where each boyfriend draws a card and gets points for various stunts. This game has resulted in, among other things, an Army Jeep being burned and a boat sunk. Billy takes the lead by kidnapping a homeless person. Craig then demands the Joker -- 500 points for a kill. He intends to murder the homeless man. Five-O aims to put an end to the game before things reach a tragic end.
- 1968–198051mNot Rated7.5 (129)TV EpisodeSteve returns to Hawaii after discovering the man who was made to look like him in Switzerland. Steve meets with Jonathan Kaye and some other people to find out why Steve was framed. They know Wo Fat is behind it. Steve learns that the only anomaly was their tracking station went out for a few seconds. Steve wonders if that is what Wo Fat is working on because they know that all this about Wo Fat trying to get 90 seconds for something and with their tracking system down for 90 seconds; what could happen? They look at everyone who could have done it, Steve thinks they should look at a scientist named Vogler and they do. They learn that Vogler came to Hawaii because his daughter suffered an allergic reaction to pollen that somehow got to where they live. But the doctor tells them it's impossible for the pollen to be there at that time of the year. So Steve thinks someone made the girl sick so that her father would have to go to Hawaii. Later a Russian agent arrives who gives them some information that helps them. Steve talks to Vogler and he has a breakdown. They then give him a truth serum that's when they learn what's going on.
- Several women have been strangled in Honolulu. The pattern in all of the cases was that after each killing, the killer would put make-up and a wig on each victim as if he wanted her to look like a prostitute. Also, in each case except for one, the killer seemed to have a key to the house of his victims. However, the one exception was the home of a private investigator whose wife was killed. It is eventually theorized that the killer is looking for a prostitute who he was obsessed with.
- 1968–198050mNot Rated7.5 (155)TV EpisodeA pair of con men sneak into Five-O' headquarters at night to photograph the layout of the offices. They then use these photos to duplicate the offices in an abandoned building, and also hire actors to impersonate McGarrett and the other members of Five-O, as part of an elaborate scheme to extort money from businessmen who may not be aware of the real location of Five-O, nor personally acquainted with its top operatives.
- 1968–198050mNot Rated7.5 (123)TV EpisodeMorgan Hilliard is accused of murdering his associate, kidnaps McGarrett in an effort to clear his name, but he doesn't want to leave his germ free yacht.
- The Hawaiian kumu mob attempts to take over a resort-workers union, to the fury of native Hawaiians who vengefully infiltrate and smash underground activities in lawless fashion. Meanwhile, Boston ex-cop James Carew trails a mainland gangster - who is providing aid and comfort to the kumu - to Hawaii in order to get information on the murders of his wife and child.
- 1968–198051mNot Rated7.4 (253)TV EpisodeDanny Williams is indicted and jailed after an off-duty pursuit leads to a suspect's death.
- 1968–198050mNot Rated7.4 (119)TV EpisodeA skydiver and a private pilot team up to retrieve heroin shipments from the ocean and then airdrop them onto Oahu, in order to evade a recent tightening against drug smuggling into Hawaii. McGarrett and Five-O learn that there is something afoot when an addict who knows of their plan is gunned down in a telephone booth as he tries to warn Five-O.
- The operator of a Honolulu museum devises a scheme: use the premier Hawaiian parade as the cover for the biggest bank robbery in Hawaiian history. First he kills a history expert who would know he was fudging the details of the recreation of the 1889 Wilcox rebellion. He also recruits criminals who can execute his plan. Once the caper occurs, can McGarrett & Co. rebound to bring the criminals to justice?
- Two women are strangled and portions of a poem are written, in lipstick, on their legs. The second is the girlfriend of Dan Williams. He is on edge, wanting to work on the case "or else it's going to work on me." Danno, however, beats up a person who knew his girlfriend before Kono and Chin Ho can stop him. It turns out the real killer is Walter Gregson, who really wants to kill his wife (a friend of the two dead women) and make it appear all the deaths were committed by a psychopath.
- A mainland mobster arrives in the Islands planning to buy a semi-pro football team and skim the profits. When his brother, who has lived in Hawaii for some years, warns him that "they do things differently here," the mobster sneers: "This place is just Cleveland with coconuts!" Big mistake. McGarrett puts surveillance people on the mobster's trail and tells them to make the surveillance so obvious that anyone the mobster tries to threaten can just point to the cops and laugh in the mobster's face (sometimes the trackers do it too). The mobster tries to bribe Chin Ho and winds up with a lovely thank-you letter from the charity Chin donated the check to. And on and on and on, until the mobster brings in a hired gun to go after McGarrett, then gets hold of a weapon and tries to finish the job himself. Finally the mobster, having lapsed into diabetic shock and been admitted to McGarrett's hospital, fakes a fire alarm to get into McGarrett's room and shoots his "body" on the bed -- only to have the lights come on and McGarrett (who was propped up in a closet) tell him that Five-O "made" him with one look at his MedicAlert bracelet.
- Raymond Parmel, a murderous former soldier, claims to have the remains of Peking Man, the fossilized bones of prehistoric humans found in China in the 1930s that disappeared shortly after the attack on Pearl Harbor in 1941. McGarrett must deal both with him and with a professor who represents the government of the People's Republic of China, which wants to recover the bones as a Chinese national treasure, and doesn't care whether Parmel is captured or not.
- A Soviet spy ring, led by a murderous femme fatale posing as a nurse to get sodium pentathol for truth serum, kidnaps an engineer on a nuclear sub and replaces him with a lookalike (Dale Robinette plays both roles), who is assigned to learn all he can about the sub and pass it on to the real engineer, who will then be taken to Moscow and grilled by the KGB.
- An undercover cop from McGarrett's office is murdered during a drug buy. Five-0 quickly learns the identity of the killer; they prepare to arrest him. But an FBI agent intervenes, he tells McGarrett to stand down. The shooter is in the protected witness program, and the Justice Department is using the man to go after an organized crime ring. McGarrett objects, but he is forced to work with the FBI agent. The Syndicate sends a hit man to go after the protected witness, and anyone else who gets in the way.
- A businessman at a convention in Honolulu decides to indulge himself just a little bit more and plans a one-night stand with a prostitute. When he gets to her apartment, he hears a knock on the door and is told to hide on the terrace. The woman's new guest is a brutal mobster who throws her off the balcony to her death. The businessman has a Hobson's choice of reporting the crime and facing repercussions from his Kiwanish-like home town, not reporting it and having a guilty conscience, or what actually happens -- he doesn't report it, but the mobster's goons figure out there was a witness to the crime and go after him anyway. Will the businessman 'fess up to his indiscretion (pretty rank even now, think about what it was in 1969) or face getting blown away by a shotgun in a parking garage (which is just what happens at the two-thirds mark of the show; they miss but plan to try again)?
- Five-O is protecting Billy Madrid, lieutenant to a crime boss who will testify in an upcoming trial. McGarrett is wounded when a sniper shoots at Five-O officers escorting Madrid, an indication that the crime boss wants Madrid dead. But when the trial actually starts, Madrid tells a different story -- that McGarrett forced his testimony. Now, McGarrett & Co. must find a way to recoup or else the crime boss will go free.
- 1968–198051mNot Rated7.4 (122)TV EpisodeMcGarrett must figure out how to get the goods on a mobster who is trying to clinch a mainland deal while murdering his enemies (including a past girlfriend) and putting them in an incinerator, which wipes out all traces of their existence -- or does it?
- McGarrett hunts for a local boy whose life he turned around but who got into trouble again after he joined the Navy.
- Five-O intercepts a "box man," an expert safe cracker, at the Honolulu airport. The criminal is killed by a shot from Dan Williams, who fired just before the criminal would have shot Chin Ho. The man had $20,000 and instructions to check into a hotel on Hilo. McGarrett goes undercover, posing as the box man. The lawman finds himself involved in a conspiracy involving two other criminals, Swanson and Andre, as well as a woman. All claim to know nothing about "the Man" who is sending them instructions. Eventually, McGarrett discovers the target of the plot -- a yacht where a diplomat of another nation is staying which has six kilos of heroin in a very secure safe. (This episode apparently takes place before episode 1.16, "The Box," where Swanson appears as an inmate in Oahu State Prison.)
- When Tony Alika's guns shoot out a tire on a police car, resulting in the death of a cop and the near-death of Duke, the whole crime is captured on film by a free-lance photographer (a "stringer" in the trade), who goes to Alika and tries to blackmail him and a mainland hood.
- McGarrett is called in to talk to Toni, a tough-talking young woman who has recently been busted along with her boyfriend. Toni is going to prison and can live with that, but she wants to get married (she's pregnant) before then in an elaborate ceremony. In return, she will testify against a mobster who has always beaten the rap -- "How about murder one? ... With his own two hands?" McGarrett counters that the mobster will use all of his many resources to knock off the couple, but Toni is adamant and McGarrett goes to work with the help of the reporter he's dating.
- A rare 1913 Liberty Head nickel, one of only five ever made, is to be auctioned at a coin show held at the Ilikai Hotel. European master criminal Eric Damien gets con artist and sleight-of-hand expert, Arnie Price, freed from jail so that he can switch a cleverly-made fake with the original before the auction. But things do not go as planned, as Price, fearing capture, tries to dispose of the nickel in a news rack, and the chase is on to recover the nickel before anyone else finds it.
- Four men, posing as Army specialists whose truck overturned and spilled cannisters marked as deadly VX nerve gas, evacuate a small town on Oahu's remote north coast. That evacuation includes the bank, which the criminals then saw into and knock over for a fortune. McGarrett immediately orders a roadblock on the only highway up that side of the island, stranding the bank robbers far from any point of escape. McGarrett mans Five-O headquarters (he's absent from the action for most of this show) while Danny, Chin and Ben go op to investigate. The two mainland "haoles," a music-company owner and his buddy, have prepared for this by breaking down hundreds of old 8-track cassettes, stuffing the money inside them and giving them, a few at a time, to one of the locals, a driver for the resort hotel where they are staying, who can take them out in his van on supply runs and stash them elsewhere. The question, though, is whether the other local, a bellman at the same hotel, will crack under the stress of the investigation. He does, and is murdered. Soon the other local is slain as well. Five-O has a pretty good idea who committed the murders, but still has to catch them in the act of transporting the last of the money on their own. A good shootout at the end.
- McGarrett receives a call from a Skid Row bum who hangs up before disclosing vital evidence in a mainland case. When McGarrett and Danno arrive at the man's fleabag apartment, he's disappeared, with a trail of blood indicating he was robbed and shot but managed to escape. In his mattress, the investigators find some silver certificates which they recognize were used as ransom money in a mainland kidnapping eight years ago where the victim was murdered and the kidnappers escaped. In the interval, silver certificates were removed from circulation and are therefore now "hot money." Five-O figures out that the man who called them was the bagman for the killers and took off with the loot, and they've finally tracked him down. When a woman spends two $20 certificates at a dry-cleaning establishment, Five-O realizes she's one of the killers, but can't find her yet. They do find the dying man, though, and he tells Five-O that a husband-and-wife duo shot him and took off with most of the certificates -- and that the duo's mainland accomplices, whom they also stiffed, are in Hawaii looking for them as well.
- A German journalist, in Honolulu to interview an exile from the Greek military junta's rule, is shot down as he exits the airplane. The journalist survives, but barely, as the bullet came within an eighth of an inch of his heart. The exile, a doctor, takes an interest in the case and secretly moves the journalist into his fortress-like mansion to take care of him himself. But McGarrett becomes suspicious as various details to the shooting don't add up, and comes to think the shooting was a setup for a very different assassination attempt.
- Mendoza is the manager of a string of warehouses along Hawaii's waterfront. He, his daughter and a group of hired thugs knock over the warehouses one by one and steal their contents. A robbery goes horribly wrong and ends in the death of an HPD officer. A robber, shot in the stomach, manages to get away with the manager's daughter in tow. They park their truck in a deserted area and try to hide. What they don't know is that their stolen cargo is a vat of highly volatile chemicals which will explode under the tropical sun in a matter of hours.
- A war hero back from Vietnam dies under mysterious circumstances. Was it a murder or a suicide? For McGarrett, finding the truth is no easy matter, as neither the victim's family nor the U.S. Army are willing to cooperate.
- 1968–198050mNot Rated7.3 (107)TV EpisodeAfter killing a drug dealer who stiffed her, an impoverished psychotic woman asks her friends (who are in similar dire financial straits) to go with her on a scheme to rob tour buses for the valuables the tourists are carrying. The other two women agree, but things go south when the leader, Dina, starts using her big .45 automatic far too many times.
- 1968–198051mNot Rated7.3 (119)TV EpisodeA shipping company which runs lots of valuable cargo through the islands is cherry-picking the most valuable items, taking them out of the shipments, and selling them on the black market. They also have a habit of killing anyone who gets too close to their operation. Their fatal mistake is stealing a quantity of medicine which is the only thing that can save an importer/exporter's critically-ill wife. When the emergency re-order arrives too late, the husband -- who has been cooperating with Five-O -- goes off on his own to seek vengeance.
- A U.S. serviceman, in Hawaii for R&R, becomes a pawn in a fight for control of a numbers syndicate. The head of the outfit, Philip Lo, is killed and the serviceman has been framed for it. McGarrett & Co. race to solve the killing, shut down the numbers syndicate and prevent the serviceman from becoming the next homicide victim.
- Five-O's Chin Ho Kelly is framed as part of a plot to discredit the state police unit. McGarrett & Co., however, turn the tables on the man responsible for the plot.
- A military scientist is kidnapped by a co-worker and held ransom for one million dollars in diamonds. Five-O identifies unique background noises from the taped ransom messages to locate the kidnapper.
- Egotistical author Travis Marshall discovers the unmarked grave of heir Brian Henderson. Marshall is promoting his find to the media, much to the annoyance of McGarrett & Co., who have re-opened an investigation. Brian Marshall has been missing for seven years. Five-O has to reconstruct what happened to the heir, with no help from Marshall or Agatha Henderson, the wealthy grandmother of the dead man. The case turns out to be an elaborate jigsaw puzzle for McGarrett, which is further complicated when Marshall turns up dead.
- 1968–198050mTV-PG7.3 (80)TV EpisodeTo get out from the thumb of the Hawaiian kumu mob, the manager of a promising singer tries to cut a deal with a mainland gangster to get them to buy up her contract, leading to the threat of a vicious mob war.
- McGarrett receives a cryptic letter and a photo of a woman with an "x" drawn through it. The woman was stabbed repeatedly. Later, another is killed the same way and Five-O gets another letter. The victims both worked at the same company, Hawaiian Amalgamated Industries. The company is headed by the headstrong Martha, who employs two nephews, Arnold and Charlie. The killings are a ruse, intended to create the impression of a psychopath killer on the loose. In reality, the killer is Charlie and he kills Martha so he can inherit his share of her estate. He also stabs himself to make it appear he was a target of an attack. But Martha's will has Arnold take over running the company and a relatively modest trust for Charlie. The development spurs Charlie to try to kill Arnold and frame him for the killings.
- The primary witness before a grand jury investigating a Hawaiian crime figure dies suddenly on the stand. At the same time, assassins from Japan are trying to kill the accused criminal. Five-O has to figure out the accused man's secret and why killers from Japan are after him.
- Susan has been having an affair with a man involved in skimming the gambling take from some Las Vegas casinos and has been acting as a courier, taking the money to Hawaii. She decides to get out and, in a fight, with her boyfriend, shoots him. She thinks she killed him. What she doesn't know is that a hit man entered the boyfriend's apartment minutes later and killed the man. Now, Susan is on the run -- not knowing the hitman is about to make her his next target. Five-O tries to find Susan before it's too late.
- 1968–198051mNot Rated7.3 (150)TV EpisodeAlexander Kline, a brilliant scientist who had worked for the U.S. government, creates the Q strain, a bacteria that can wipe out vast numbers of people in a short time. He quit his U.S. position. To protest research into biological weapons, he will use the Q strain to wipe out Hawaii's population. Five-O catches up to Kline but the scientist has already left a vial with the killer bacteria in a place where it will spread.
- A young singer is kidnapped shortly after a performance. The singer's father is a hotel magnate from the Mainland. However, the crime began as a hoax, and the two kidnappers are friends of the singer. Once the hotel magnate offers a big reward, the friends decide to collect -- at any cost.
- 1968–198050mNot Rated7.3 (131)TV EpisodeA man named Winkler goes berserk when approached by a television reporter doing a "man on the street" story. After his arrest, Five-O and HPD can find no evidence that Winkler even existed until seven years earlier. For Five-O, this is just the start of a complicated investigation full of shadowy figures and murky motives. Winkler, for example, has a number of aliases and a photographic memory. Eventually McGarrett & Co. uncover a plot to assassinate a Soviet defector.
- A man who's an expert in both geology and explosives, owes loan sharks more than $72,000. He has planted explosives that, if set off, will cause volcanic eruptions and is demanding $500,000 from the state of Hawaii. He has killed accomplices and is prepared to go through with his threats. But he doesn't know his fed-up wife is preparing to double cross him.
- A dead body is found in a sugarcane field, which turns out to be that of Frank Kealoha, owner of a large nearby ranch. When informed of her husband's death, Kealoha's widow asserts that she knew he was dead - she had buried him several months before. As the title suggests, however, there is a stranger's body in Kealoha's grave, leading McGarrett and Five-O onto the trail of a missing federal agent, and into an investigation of money laundering and murder.
- A mystery writer goes to investigate a cryogenics foundation which purports to freeze dead people and revive them when a cure can be found for their diseases. But the writer soon figures out that the frozen victims never really wake up (a "Revival" is staged by an employee), and the foundation is actually getting them to sign over their assets, and killing them.
- Someone is playing a deadly game of 10 Little Indians with the heirs to a wealthy, now-dead artist, who left his fortune to anyone who could survive him by one year. Not only was the artist murdered by a lethal overdose in a medication he took, the heirs one by one are falling victim to booby traps set in their most prized possessions.
- A returning soldier that saw combat in Vietnam returns to Hawaii and has a severe flashback that leads to him taking over a hospital including Dan-O as a hostage.
- An uncooperative news-woman predicts the abduction of a princess, and McGarrett's search ensues.
- McGarrett receives a phone call from a woman in Singapore saying that she can witness against a local mobster. McGarret immediately flies to Singapore to retrieve her. The mobster in Hawaii, knowing that the girl can finger him, has a contract put out on both McGarrett and the girl. Unable to get to the airport, they board a ship bound for the Philippines, where their lives are threatened again. As Chin Ho arrives in Manila, another hit man is waiting for them.
- A state official is killed by a bomb after arriving from a visit to the Mainland. Five-O discovers the official had more enemies than it initially appears.
- 1968–198051mNot Rated7.2 (104)TV EpisodeA British Intelligence agent helps McGarrett try to find a missing nobleman who is suspected of treason and murder.
- Just as the ransom money has been delivered, the kidnap victim escapes; one of his two kidnappers falls to his death trying to chase him. The surviving kidnapper concocts another scheme: he holds the ransom money (which is hot) hostage and tries to coax the kidnapped boy's greedy father into laundering it for him. The kidnapper, an accomplished scuba diver (the source of the episode's title) plans to swim underwater to and from the dropoff point. Five-O identifies the kidnapper and tails him, at one point donning frog masks in an attempt to rub his nose in his activities, but the kidnapper relies on the father to shake any tails and deliver the money to him at 25 cents on the dollar, the standard rate for laundered money. It sounds like a great bargain for the father and he holds up his end of the deal -- but that's not the end of it.
- During a high speed chase, a woman jumps from the car which the police had been chasing. McGarrett arrives to hear her dying words, "The ways of love." She was also somehow wearing a diamond earring that was part of a display of a foreign nation's Crown Jewels which were stolen while in Hawaii a few days earlier. At the dead woman's home, there is a letter addressed to Dave Barca, who is incarcerated in a California jail but who had been in Hawaii when the jewelry robbery occurred. McGarrett goes undercover, posing as another prisoner at the jail in California. Meanwhile, Danny Williams and other 5-0 officers find specialized X-ray equipment in the now-abandoned car involved in the chase. It turns out the thieves used the X-ray equipment to discover the combination of the safe that housed the jewels. Now, it's up to McGarrett to use Barca to find the jewels.
- McGarrett is awakened at 3:00 A.M. by a phone call from a past girlfriend, who hangs up before he is fully awake. The girlfriend then goes back to her husband's beach house and finds him dead from multiple blows to the head. Pieces of evidence around the crime scene implicate the woman, and eventually McGarrett is forced to arrest her (amid numerous flashbacks to their romance when McGarrett was a Navy lieutenant -- there are scenes filmed at the U.S.S. Arizona memorial where the woman's brother died on December 7, 1941). But not only does McGarrett have to fight his own emotional involvement, he has to check out at least three other possible suspects in the killing: the husband's law partner, his daughter from a previous marriage and the daughter's hot-shot attorney fiancé' who knows a great deal about crime scenes.
- Some kids steal an ambulance, one of the attendants tries to stop them but is struck. One of the kids wants to go back and help the man but they keep on going. When they reach their destination the one who wanted to go back is upset, saying that no one was suppose to get hurt. That's when he walks off and a couple of them follow him. He goes to the Iolani Palace and one of them tries to talk him out what he is thinking but his mind is made that's when he is shot. Steve is upset. Later they put their plan in motion, wherein two of them go to a weather monitoring station and make the one there announce a Tsunami is coming. And that's when the island is in an uproar. That's when the rest rob a jewelry store. Steve upon learning the whole thing's a hoax and help but wonder if it and the dead young man are connected.
- The daughter of a dictator is kidnapped from the University of Hawaii campus. The conspirators are young people committed to overthrowing the dictator, known as El Diablo. One of the conspirators is El Diablo's illegitimate daughter from an affair and resembles the daughter. After El Diablo is assassinated, the question is whether Five-O can save the daughter.
- French McCoy, thug for a Miami mobster, turns up dead (stabbed in the chest) and mutilated (one of his pinkie fingers cut off). The mobster, known as "Big Uncle," was looking to move into Hawaii. One of four Hawaiian mobsters is responsible. McGarrett must figure out which one before a gangland war erupts.
- A derelict sailboat is discovered just offshore of Oahu. McGarrett and a Coast Guard officer board the vessel and find the crew murdered as well as several rats, both dead and alive. However, McGarrett also notices the telltale signs of bubonic plague on several of the crew. McGarrett is put into isolation and asks Danno to find out who the passengers were. It is soon discovered that the boat was of Tahitian registry and the passengers were Tommy Brown, an accountant for the mob, as well as his wife Teresa and Teresa's father Leo Paoli, a mobster who was deported to France after being convicted of his mob activities. Now it is a race against time as Danno searches for the trio who are carrying plague spread it to the populace of the island and cause an epidemic.
- 1968–198051mNot Rated7.1 (111)TV EpisodeThe U.S. Navy cooperated in the filming of this story about a shipboard heroin ring, lending the Destroyer U.S.S. Whipple and having real-life Admiral Joseph McGittrick play a substantial role as the admiral in charge of the Navy's substance-abuse recovery program. With McGarrett in uniform to supervise, Danno goes undercover as a medic treating an addict and trying to get him to produce his supplier's name with an amnesty promise. Several sailors also have speaking roles.
- Clark Sloan, a prominent businessman, married a "trophy wife" and is killed in a boat explosion which McGarrett survives, now it's up to Danno and the team to find the motive behind it
- A gang of hijackers sign on as crew members of luxury yachts, then murder the owners and steal the boats to sell in South America. Danno and Sandi Welles go undercover to track them down, but Sandi is taken hostage on one of the boats. The title comes from the particularly sadistic gang leader flipping a coin to decide whether Sandi and the other hostages, whom he's going to throw overboard, will be given a life raft.
- 1968–198050mNot Rated7.1 (77)TV EpisodeA rich developer's wife has been kidnapped and an ecology activist has been implicated. But the activist is innocent and has been framed. McGarrett & Co. try to solve the crime and find the kidnapped woman. As the title implies, the developer's neighbor holds the key to the mystery.
- McGarrett has been dating a fashion designer named Cathi Ryan. He receives an urgent telephone call from her one afternoon, and arrives at her house to find her apparently having just been killed. Then he is hit on the back of the head, and awakens to find neither the telephone nor his police radio working. He manages to report the crime, but then discovers that there are a number of clues suggesting either that he committed the crime -- or that he has been the victim of an elaborate plot to frame him for murder.
- 1968–198050mNot Rated7.1 (85)TV EpisodeThe wages of sin are death for prostitutes who are being murdered by a pimp and his totally psycho helper in an effort to get the survivors to join his "stable." The women organize on their own and try to fight back, but are reluctant to go to the police because they could spend a long time in jail. But as the frequency and viciousness of the attacks increase, McGarrett establishes a tenuous pipeline to the women's leader to try to trap the enforcer.
- 1968–198050mNot Rated7.1 (116)TV EpisodeA Chinese Minister comes to Hawaii for a conference and Steve is placed in charge of security. Unbeknownest to him Wo Fat plans to assassinate the minister but because of Steve's precautions his attempts fail. But When minister's grandson wants to go to the circus that's in town, Steve needs to make sure the minister is secured but one of his people works for Wo Fat I and informs him of his plan and tries to use it. He learns two of the performers are from Cuba and used their relative's identities to escape. He coerces them to Help him assassinate the minister.
- A current wave of liquor store robberies and shootings are strangely linked to a fiveyear old bank robbery in which neither the quarter-million-dollar booty nor the thief was ever found. Charles Cioffi guest stars as an HPD officer, who, when the link in the crimes is uncovered, desperately hunts for the man behind the liquor store crimes.
- Colin Nichols is a vicious British soldier of fortune, looking for a missing art object that is part of a set of ancient Hindu figurines known as the "Ring of Life." He tortures and kills one man in Hawaii in pursuit of the missing piece, hoping to claim a $1 million reward from the government of India for return of the stolen item. The murder brings McGarrett and Five-O into the case, but it turns out that Nichols is not the only one after the missing artifact or the reward.
- Singer Chelsea Merriman witnesses Koko Apaleka striking his girlfriend, causing her to fall from a high-rise balcony. Chelsea initially tries not to become involved, resisting McGarrett's attempts to get her to testify. But, after Koko tries to intimidate Chelsea by sending a doll with a broken head to Chelsea's daughter on the Mainland, the singer decides to cooperate with the authorities. Now, McGarrett & Co. must protect Chelsea from Koko's attempts to have her killed.
- In Oahu State Prison, cons led by Big Chicken want to bring Swanson to heel because he doesn't show enough respect for "the system." But Swanson manages to shoot one of his attackers with guns the cons had smuggled into the prison. Swanson gathers up prison guards as hostages to try to get out of the prison. Swanson says if he's not let out, he'll start killing the hostages. McGarrett offers himself up as a hostage to try to head off bloodshed.
- Two idealists plan to kidnap the son of a Japanese industrialist as a way to generate $1.5 million toward their dream of researching ways for man to live under the sea. They don't realize their confederate is really part of a Japanese terrorist group. She has no intention of letting the boy live. Five-O has to race against time. The kidnapped child is in an airtight capsule underneath the ocean and he has only a limited air supply.
- An ex-cop turned private eye murders pimps in order to rescue their girls from lives of prostitution, particularly a youngster he's formed a special bond with.
- A Russian musician is planning a concert using a priceless violin. After it is locked in the trunk of their car, three derelicts steal the car and strip it. Forcing the trunk open, they see the violin and decide to sell it to a violin teacher. Against McGarrett's wishes, the Russian diplomats offer a $10,000 reward for the return of the violin. The punks steal the violin back and kill the teacher. They decide to ask $30,000 for the return of the violin, which the Russian quickly agree to. When the money is delivered, the men decide to kill the Russian violinist, just as McGarret and his men show up.
- A group of masked men break into the home of an international arms dealer and kidnap his wife. McGarrett soon realizes the case is far more than a simple kidnapping - he's now involved with agents of a foreign civil war.
- An ex-military demolitions man is drugged and framed for the explosion and total destruction of a sewage treatment plant. Five-O pieces together clues to expose the business man who is actually behind the crime.
- A Honolulu businessman is found murdered on a land tract he was trying to develop. The case has all the earmarks of a syndicate hit. Five-O traces the dead man and finds that he was, in fact, a former thug who had testified and gone into the Federal witness protection program. But they find this out so easily that McGarrett begins to suspect that the mob had nothing at all to do with the murder -- someone close to the witness, who knew all about his history, killed him and pinned it on the mob. Suspicion soon falls on the dead man's wife and her lover, who were to be the beneficiaries of a $100,000 insurance policy paid by Uncle Sam if the witness was indeed whacked (the money seems like chump change when you look at the lavish mansion where the dead man lived). McGarrett and the Federal agent overseeing the witness protection program plan in Hawaii, who have often been at odds in the past, begin to collaborate in trying to fool the killer or killers into thinking the mob is after them -- because the dead man had a surgically altered face, he could be anyone, including the wife's lover.
- 1968–198051mNot Rated7.1 (143)TV EpisodeAlexander Kline, even under intense questioning, refuses to reveal the location of the vial containing the Q strain. McGarrett gambles that by letting him go, Kline can be convinced to change his mind. Kline has fallen in love with a woman, who convinces him to not follow through with his plan. But, even as he relents, the vial with the killer bacteria is not at the dock where he placed it.
- Five-O investigates a gold-smuggling ring. One young woman is already dead as a result of the gold smuggling. Five-O and the U.S. Treasury Department devise a sting operation aimed at nabbing Johnny Fargo, a brash operator, and the wealthy attorney who is the brains behind the operation.
- Joey Kalama, son of police detective Phil Kalama, nearly goes down in a boxing match then comes back to win the fight. Later, he is beaten by two thugs and dies. McGarrett & Co. investigate the death while trying to rein in Phil, who is also probing the case. The heat is turned up on Five-O after Joey's manager falls to his death accidentally while Phil was trying to question him.
- 1968–198050mNot Rated7.0 (143)TV EpisodeChampion race car driver Alex Pareno arrives in Hawaii to attempt to break the record for driving up Tantalus Mountain. However, his chief mechanic is bludgeoned to death after catching someone tampering with Pareno's car. Later, a second mechanic is killed while test driving the car. McGarrett eventually discovers plenty of suspects ranging from Pareno's fiancée Angela, who was being blackmailed by an ex-lover, to Pareno himself. However, it is eventually discovered that the killer is someone very close to Pareno.
- A man arrives at Honolulu International Airport and is taken to the hospital after being struck by a car. Upon reviving, he checks the bag he was carrying and, being unable to find something in it, takes a cyanide capsule he had hidden in his jacket pocket and dies. The hospital had taken the object and put in a safe with his other valuables. Five-O discovers the object is part of a small surface-to-air missile. McGarrett recruits a police officer who can pass for the man and he will make attempt to make contact with those the dead man was going to meet. Five-O uncovers a plot to assassinate an exiled political leader who is heading to Hawaii for a layover as part of a trip to his homeland. The conspirators soon use one of their SAMs to avoid detection. The second will be targeted at the exiled political leader and everyone who is on the same commercial flight he is.
- A hit man takes a shot at a man on a boat arriving in Honolulu harbor from a distance of about a half mile, using an old tower on Sand Island as his sniper's nest. An apparently homeless boy named Moki, however, witnesses the hit man as he fires the shot. The hit man gives chase, but Moki escapes. McGarrett manages to locate the boy and sends him to juvenile detention for his own protection, but he does not figure on the intervention of Frances Chai, a crusading deputy public defender.
- 1968–198051mNot Rated7.0 (137)TV EpisodeGary Phillips, the mentally challenged son of baseball star Lon Phillips, encounters a woman while on his way to the concession stand during a ball game. She turns up dead shortly there after. Was he responsible? Or does he know who was?
- Two hippies, panhandling for money, decide to approach a tourist. The first hippie, a young woman, is rebuffed. However, the tourist comes on to the male hippie who freaks out and bludgeons the tourist, taking the man's wallet in the process. The wallet contains a key to an airport locker which contains a briefcase full of money. It turns out the tourist was an embezzler whose bounty is being sought by persons unknown who will do whatever it takes to get the money back.
- Five-O investigates a spy ring. One of the suspects is Dr. Paul Farrar. However, unknown to Five-O, Farrar's superior is Wo Fat. Farrar plans a death trap for McGarrett.
- An Australian scientist is killed on a Hawaiian sugar plantation after discovering an insect capable of wiping out the sugar cane there. The investigation leads McGarrett and Co. to a complicated plot hatched by crooked developer Sam Patton (portrayed by Richard Kiley) to buy the plantation for a greatly reduced price. Before Five-O can solve the case, the death toll will rise.
- An entity calling itself "Mercury" threatens to explode an atomic bomb in Honolulu unless it's paid $100 million. Five-O enlists the aid of a nuclear physicist to find the bomb and apprehend the terrorist.
- Two mobsters wage war on each other, with Danny's photographer girlfriend -- who snapped a picture of one of the two sneaking back into the Islands -- caught in the middle.
- McGarrett goes all out to keep the lid on a threatened organized crime war by tracking both an unknown hit man and his target.
- Morwood, a high school official, has organized a smuggling ring. His confederates are forced to toss a drug shipment overboard as the Coast Guard is ready to close in. Morwood's group knows the approximate position but can't make a move because Five-O and the authorities have the heat on. But when Morwood spots a mini-submarine he gets the idea the the vessel could snatch the drugs out from under the nose of the police.
- To the horror of workers at a construction site, the truck of sand they are unloading contains Danny Williams in the back, unconscious and just moments away from having smothered to death. Danny awakens, but can't remember anything about how he got there. McGarrett grills the sand-truck driver, but eventually abandons him as a dead end. The only other way Danny could have gotten into the dump truck was to jump in from a height as the truck passed below him. Danny remembers he was going horseback riding on his day off, so the Five-O team heads out to a ranch that rents horses for pleasure rides. Eventually they find the body of the horse he was riding, shot multiple times and leaving a long trail of blood. That means Danny was fleeing from gunmen and made his leap as a last resort. But what did he see that made the gunmen chase him. The answer turns out to be a literal suicide bomber, the ranch owner, who is getting revenge on a Chinese visitor by having a bomb-laden boat (with mannequins at the helm, which is what Danny saw being loaded into a truck headed for the harbor) "steering" it by remote control straight into the man's yacht with the dignitaries aboard. (Presumably the thugs got paid in advance). McGarrett and the Five-O crew must race the clock to destroy the bombers' boat before it can complete the madman's mission.
- A jeweler in New York City is murdered after making a paste copy of the "Queen of Polynesia", a valuable and historic emerald about to be donated to the State of Hawaii. The 5-0 squad suspects that a switch might be planned at the unveiling ceremony. Jewel thief Janet Kingston, under the pseudonym Camilla Carver, and her sidekick Michael develop a scheme to get into the unveiling when Michael observes one of the invited guests, former Broadway star Thurman Elliott, stealing a diamond bracelet at a society party. Carver and Michael blackmail Elliott into taking her to the unveiling, set at the lovely Makaha Inn. When the "Queen of Polynesia" is brought out, Carver drops the Hawaiian girl wearing it with a poisoned rose, switches it for a paste copy, and then slips the real gem to Michael, posing as a waiter. McGarrett and the 5-0 team are immediately onto the scheme and seal the hotel. They interrogate Carver, and she tries to use Elliott's cute granddaughter Amanda to slip the emerald outside to Michael, now disguised as a cop. But Amanda struggles with him, attracting McGarrett's attention. McGarrett brings Michael's car to a halt with a helicopter and the heist is foiled.
- Dr. Royce, a scientist with an expertise that can be used in the underwater detection of ships, is lured by enemy agents and his girlfriend to defect to a foreign power. McGarrett is both helped and hindered by a federal agent named Merrill Carson in trying to prevent Royce from leaving the island with the enemy agents, even as Dr. Royce gradually realizes that he is more a prisoner than a willing defector.
- Over McGarrett's strong objections, the Governor orders him to allow Terri O'Brien, a reporter for a popular new weekly magazine, to shadow him and the other members of Five-O for a story about their organization. As O'Brien follows the developments of the kidnapping of a scientist's two children, she becomes convinced that McGarrett has rushed to judge the culpability of a bus driver accused of the crime. Even as she argues with McGarrett about his decisions in the case, O'Brien begins to investigate the case on her own.
- 1968–198050mNot Rated6.9 (125)TV EpisodeA cat burglar robs a former CIA agent of a diamond pendant and a roll of microfilm. The film contains military secrets and soon agents from China and Russia, along with its original owner, begin vying for its possession.
- 1968–198051mNot Rated6.9 (118)TV EpisodeGary Phillips, on the run and afraid of the police, narrowly escapes a murder attempt. McGarrett & Co. begin to piece together what really happened at the ball park. But the real killer is still determined to silence Gary.
- An exclusive sporting club uses sport-hunting techniques to perform vigilante "justice" on criminals who beat the rap on technicalities.
- A year after a Soviet submarine was sunk near Hawaii, pieces of what appear to be key components of the sub's computer begin washing ashore. McGarrett suspects that devices have been planted to sabotage other parts of the sub's computer that were already in the hands of the U.S. government - but cantankerous scientist Grant Ormsbee insists upon going ahead with testing of the components despite McGarett's concerns.
- A chronic gambler, pretending he has cancer, sells chances on the hour of the day he will die at $10,000 apiece. The winner gets all 24 tickets. The gambler actually doesn't have cancer (he has Lou Gehrig's disease, ALS, instead), and plans to commit suicide at an appointed time so that a specific person will get the money. But as the gambler talks to his doctor outside a party, the doctor is gunned down and the gambler is forced to take his fatal drug. The gambler's corpse is then placed in a car and driven to a remote location, where the hot sun makes it impossible to tell the exact time of his death. The killer then works on eliminating the others who bought a chance, and figuring out to whom the gambler planned to leave the money.
- 1968–198051mNot Rated6.9 (124)TV EpisodeSomeone calling himself "Kaili" (the Hawaiian god of battle) wages his own personal war against polluters. At first the pranks are bad but not dangerous, like climbing a ladder to the top of a huge chimney with a 125-pound ceremonial shield and capping the chimney (thus blowing out the furnace inside and chasing everyone out of the factory). However, Kaili's actions get steadily more violent. After blasting a crop-dusting plane with a shotgun (he pulls the pilot to safety), Kaili types up a list of the five worst polluters in Hawaii and entitles it "Kaili Death List." One of the five suffers a heart attack and another flees, so Kaili goes after the most heavily guarded of the three and breaks his neck with one hand. Can Five-O identify Kaili (whose face is never really seen) and capture him without getting shot or beaten to death?
- A series of gold robberies has hit Oahu. The operation is being run out of a halfway home for boys and young men. McGarrett sends in an HPD undercover officer to the home to turn up some leads. The trail first seems to point to the home's administrator, an ex-con. He turns out to be innocent. But Five-O's investigation is pressuring the organizations of the robbery ring.
- McGarrett goes along with an old Navy buddy when the latter "investigates" a doctor who may have prescribed steroids to the Navy man's son with lethal aftereffects, but Danno and a fitness instructor find evidence which implicates another person entirely.
- 1968–198050mNot Rated6.8 (82)TV EpisodeA crusading journalist is murdered, and McGarrett suspects that the killing was ordered by Frank Devlin, a sleazy real estate developer from the mainland, who was the target of a series of articles by the journalist. McGarrett focuses his attention on Richard Royce, a down-on-his-luck former astronaut who has gone to work for Devlin to help generate interest in Devlin's new Hawaiian subdivision. Royce gradually comes to suspect that Devlin might just have been capable of murder -- especially when another person whose land Devlin wants also ends up dead.
- A hippie couple kidnaps a baby from a drug store and smuggles the baby to the mainland to sell the child to an adoption agency in Los Angeles. McGarrett and the rest of the Five-O team are able to find that baby as well as another infant that was kidnapped a few months earlier. Now they must track down the young couple before they snatch another baby.
- The vault in a relatively new bank in a shopping center is broken into, yet there appears to be no way that the thieves could have gotten into and out of the vault - there are no signs of forced entry and the alarm was never triggered. But McGarrett slowly begins to suspect Matthew Meighan, the developer of the shopping center where the vault is located - especially when the Five-O team uncovers evidence that similar burglaries have occurred at three other banks on the mainland.
- John Richard Carr, a rising member of the House of Representatives, is visiting Hawaii to judge a beauty pageant. He has a tryst with one of the contestants, who drugs him so that Carr can be filmed in her company, in order to blackmail Carr into ending his bribery investigation of a prominent Malaysian. But the woman who helps the blackmailer drug Congressman Carr is herself murdered by the blackmailer's henchmen - so that Congressman Carr is not just implicated in an infidelity scandal, but becomes a murder suspect.
- A serial killer brazenly tries to sell the rights to his story to a greedy book publisher, and then targets the publisher's daughter as his next victim after being turned down. The killer is the last person Danno books.
- A war breaks out among the pimps in Honolulu, resulting in several murders.
- The series concludes with the final showdown between McGarrett and Wo Fat. Three scientists who have disappeared have one thing in common, they all attended a symposium on possible space-based, laser defense systems. McGarrett impersonates a fourth scientist, Dr. Elton Raintree, who attended the same gathering and is soon abducted. Wo Fat is behind it all and wants the scientists to complete their work and produce such a device.
- Mike (Richard Hatch) carries a torch for Glynis (Gretchen Corbett) and concocts an elaborate scheme, involving multiple murders, so that they can be together. To catch the killer the Five-O team must analyze a surreal painting a psychiatrist made of Mike's disturbed mental state.
- Five-O begins an investigation after it's discovered a new trade center, destroyed in a massive fire, was constructed of sub-standard materials. The probe centers on Maynard, who works in the local agency that inspects building plans and construction sites. Maynard has framed, and then kills, one inspector. Five-O attempts a sting operation with the cooperation of one building but that plan goes awry when Maynard realizes he is being recorded while soliciting a bribe.
- Deadly liquefied nerve gas is stolen. Five-O investigates the theft; the substance can kill a person if only a drop touches their skin and a small quantity can cause mass casualties. But the thief isn't a terrorist or master criminal, he's a young man seeking revenge against Dan Williams. Danno investigated the young man's father, a corrupt police officer. The young man concocts a frame for Williams that Five-O will find difficult to prove false.
- The death-by-drowning of an author and human-rights advocate with proof of his government's abuses leads to a search for the murderous head of his country's secret police.
- Willy Stone, a punch-drunk former boxer, attacks a young fighter for no apparent reason, breaking the younger man's hands. Edmonds, a Detroit hood, has invested much in the young boxer and is enraged when he finds out the boxer can never fight again. Five-O seeks to find Willy before Edmonds can extract his revenge. Meanwhile, Edmonds has summoned a hit man from the Mainland to kill Willy.
- McGarrett is investigating a cat burglar who pulls off jobs in spectacular fashion. His most recent heist totaled $30,000 of jewels from a room in a high-rise hotel. The culprit is Joey Rand, a lounge singer who's also a compulsive gambler who owes a Mainland syndicate $200,000. His girlfriend, who works for a company that does tours, supplies Joey with the names and room numbers of well-to-do people. Joey is now the target of a determined McGarrett and the syndicate that's ready to kill him over the singer's gambling debts.
- A Maui cowboy (the title means "cowboy" in Hawaiian) kills a real-estate developer who's trying to take over the ranch that the cowboy owns. The cowboy tries to escape into the island's rugged highlands while McGarrett pursues, trying to get him to surrender.
- 1968–198049mNot Rated6.7 (66)TV EpisodeAfter an attempt to hijack an Army vehicle carrying M-16 vehicles goes awry, an arms dealer and his underlings recognize that the bases and transports with small arms will be more heavily guarded. But then one of his men gets an idea how to get onto an Army base using an unorthodox approach -- when two men slip into the penthouse of a hotel and make off with King Kamehameha's golden feathered cape -- using a hang-glider.
- A group of native Hawaiian separatists threaten to bomb public buildings if seven of their associates are not released from jail. McGarrett races the clock to find the bombs, and those responsible, before the deadline.
- Dan Williams is unable to prevent a young woman high on drugs (referred to as speed but which have the properties of LSD) from jumping off a cliff to her death. The incident puts Five-O on the trail of Professor David Stone, who was kicked out of "a Mainland university" for enticing students into using drugs. As McGarrett is building his case, the dead woman's father confronts Stone and forces him to take a large dosage of the drug. Stone ends up on the same cliff and now McGarrett attempts to save his life.
- When Officer Lori Wilson's husband is murdered by robbers just as he is about to become a Five-O team member, Lori herself joins Five-O to track down -- and possibly gun down -- the crooks.
- The top financial aide to Chang Liu, the head of one of the islands' crime syndicates, is ambushed and killed when he tries to return to Hawaii surreptitiously via helicopter. The killers are all members of a street gang that normally wouldn't take on a criminal organization like Chang Liu's, but the gang members have inside information given by someone close to Chang Liu - his daughter. Then Chang Liu and Five-O each try to find the $4 million in laundered money that Chang Liu's aide was bringing with him when he was ambushed.
- Danny helps a past girlfriend of his who is now a petty crook, but doesn't reckon on her taking up with a murderous bank robber and being an accessory to his crimes.
- A man, who had been a witness in a murder trial, dies mysteriously down at the waterfront. McGarrett thinks he was murdered and that his death was tied to the murder conviction of a formerly prominent politician.
- A Saturday Night Special handgun that appears to have a mind of its own goes from one person to another, leaving a trail of dead and injured people in its path. McGarrett and the Five-0 Team work frantically to find the gun, and stop the shootings.
- A shamed Japanese banker ritualistically kills himself, and McGarrett wants to know why. McGarrett demands answers from a prominent financial consultant, played by guest star Ossie Davis, and the deceased's assistant when Five-O discovers the pair are involved in an international swindle.
- Ted Frazer, a Vietnam veteran, thinks he is cracking from mental strain. In reality, he is being tormented by fellow vet George Loomis. George makes Ted think he is kidnapping children (who George has really abducted). Ted's mother also wants nothing to do with him, increasing his emotional strain. McGarrett & Co. determine there's something wrong with George's story; he has told Five-O he was in Vietnam at about the same time as Ted when, in fact, they served in the same unit. Five-O must determine the motives behind George's lies. The answer lies in an incident that took place in Vietnam.
- A emergency landing in Hawaii of an Asian dictator causes major problems for Five-O and McGarrett.
- At the request of the Governor, McGarrett investigates recent odd behavior by Sam Kalakua. Sam, a friend of the Governor's and a distant relative of Kono's, is also among the last of descendants of Hawaiian kings. Sam says he saw the Hawaiian goddess of fire, Pele coming for him and fired a gun in defense. McGarrett ("I'm a man of this century") doesn't believe in Hawaiian gods but also thinks that Sam is not senile or imagining things. Sam's closest relative is his nephew George, who is married to Eleanor, who yearns for a jet set life. The couple are aligned with a real estate developer who has designs on Sam's estate and a film maker who's an expert in special effects. When she can't get Sam committed to a mental institution, Eleanor decides it's time to kill Sam.
- A distraught man comes on stage during a live TV broadcast by a charismatic preacher and shoves an unloaded gun in his face, demanding the preacher account for the death of the assailant's wife, who was a member of his congregation. When Five-O investigates, they find the charges may be well-founded and the preacher may be heading a cult of brainwashed people to get at their assets.
- An ex-cop who's a recovering alcoholic returns to Hawaii after a long stint on the mainland in order to make amends to McGarrett (the "ninth step" of Alcoholics Anonymous) -- he was drunk on duty and failed to stop an armored-car heist which led to the theft of a fortune and the death of the car's driver. But McGarrett discovers that the cop's drink was drugged in advance by the thieves and their accomplice (the ex-cop's ex-girlfriend) -- and they are planning still another heist to replace the money, lost in a car explosion at the beginning of the show. When the disgraced cop launches an investigation of his own, he puts his life in grave danger.
- Author Millicent Shand, a friend of Gov. Jameson, is in Hawaii to promote her new novel based on her adventures. She approaches McGarrett and the governor again, this time about her niece, Carole, whose husband disappeared while scuba diving off Honolulu. Shand initially believes that Carole's husband is still alive and is conspiring with spiritualist Sebastian Rolande, whom Shand believes is a phony, to defraud her niece out of half a million dollars. Shand's initial attempts to debunk Rolande's talents as a psychic fail, but she remains determined to prove that he is a criminal.
- 1968–198050mNot Rated6.6 (73)TV EpisodeWhen the first mate of a cargo ship abruptly hijacks his own vessel, leading to the murder of a crew member and several woundings, McGarrett begins to suspect the oily shipping-company boss of possibly ordering the hijacking and apparent subsequent scuttling of the ship to keep its real cargo -- intercontinental ballistic missiles he is selling to the highest bidder -- secret.
- A group of college students devise a plan to break into Bishop Museum and steal King Kamehameha's cloak. A collection is started up and amnesty will be given if the cloak is returned. Meanwhile Five-o investigates and concludes that the college students stole the cloak. Kono tries to reason with one of the students, who is Hawaiian, and make him understand how wrong it was to steal the cloak. The others decide to keep the cloak rather than collect the reward. The Hawaiian student (Johnny) comes to Five-O headquarters and tells McGarrett that the others are planning to dump the cloak overboard from a boat. The Five-o team shows up at the pier as the boat is leaving, and the students raise the cloak on the boats mast.
- A man named Jim Spier breaks out of prison, shortly after refusing to accept parole for the second time. Spier had been convicted of the murder of his wife, but had always claimed to be innocent of the crime. With assistance from a beautician friend of his, Spier changes his appearance and begins to investigate the case against himself anew. McGarrett and Five-O also look into the crime again, even as they search for Spier - and find that upon re-examination, at least some of the evidence against Spier doesn't appear to be that solid.
- A group of university students and their professor are examining a volcanic crater when they discover the bodies of five men in an inconspicuous location. Doc Bergman is initially unable to determine the cause of their deaths, so he enlists the aid of cantankerous physicist Grant Ormsbee, with whom McGarrett and Five-O are already familiar (from the previous season's "The Defector"). Five-O eventually learns that most of the dead men came from a variety of foreign countries, and that all of them died from exposure to radiation - creating an even bigger mystery for Five-O, because there is no lawful source of radioactive material, nor a facility working with it, in Hawaii that could have led to this exposure.
- The body of a murdered federal agent is found, and Five-O is contacted by the government agency that sent him to Hawaii, which also sends another agent, Glen Fallon, to Hawaii to assist Five-O. McGarrett and Five-O discover that the murdered man was investigating the possibility of a "sleeper" agent within the March Foundation, a think-tank funded by the U.S. government. The evidence uncovered by McGarrett and Fallon begins to suggest that the Foundation's chief, Dr. Rathman, is the "sleeper" that the murdered agent was looking for.
- When a notorious smuggling-gang member known as "Surfer" uses his .357 Magnum to render still another enemy unrecognizable, McGarrett tries to infiltrate the gang with a Maui policewoman who has no experience in undercover work.
- 1968–198050mNot Rated6.4 (106)TV EpisodeA series of bomb threats against a state senator culminate in a car-bomb blast that kills his secretary. But Five-O realizes that the only tie-in to the threats and explosions is the senator himself.
- Because the country of Japan has very strong restrictions on handguns, smugglers can turn huge profits by buying or stealing them in Hawaii and seeking them on the Tokyo black market. A Tokyo police officer, who narrowly escaped an assassination attempt on the Tokyo street and picked up the assailant's weapon, traces it to Honolulu. He arrives there and tells McGarrett of his find, and the two of them form a task force to find the leaders of a Hawaiian smuggling ring.
- A group of revolutionaries from a Latin American country have entered Hawaii illegally, raided an armory and stolen weapons and ammunition. Their leader is wounded and captured by McGarrett but his men manage to whisk him away from the hospital where he is being held. However, the leader, who has lost a lot of blood, will die without further medical attention. Five-O attempts to recapture the leader and stop the weapons from leaving Hawaii.
- Sunny Mandell, a teenage runaway, holes up in Honolulu with a man who helped her back in Los Angeles. But the helpful man is a gangster with a grudge against Sunny's father, a Los Angeles cop who sent him to a California prison. The gangster takes Sunny to a hotel where he murders an associate and forces Sunny to take hold of the murder weapon, leaving her fingerprints on it. Sunny's father has meanwhile arrived in Honolulu and consulted with McGarrett about the connection. With the unlikely help of a Peeping Tom who witnessed the murder with his telescope, they clear Sunny of the murder but can't find her - she ditched the killer and went panhandling on the streets, where the leader of a weird cult found her and offered her refuge in the cult's group home while indoctrinating her. It becomes a race against time and a battle of wills as McGarrett, the cult leader and the murderer all compete to get Sunny under his control.
- A respected physician on a remote island is found dead, and an autopsy reveals he was blown away with a shotgun while night swimming. The only suspect is a young-Turk doctor at a local clinic, who was convinced the old doctor had botched operations and killed people. But when other people's stories turn up inconsistent, McGarrett realizes the old man was covering for a series of shady financial transactions and was killed -- by someone else -- because he knew too much and was blackmailing somebody to hang onto his job. The killer is not revealed until late in the show; a good fistfight in a horse barn caps this episode.
- McGarrett and company are called in when an archaeological dig on The Big Island reveals secret tunnels headed underneath the ocean, which could lead to the grave of King Kamehameha I. Or at least somebody believes so, donning a royal robe and mask to frighten off -- and later kill -- two members of the archaeological dig.
- When a Soviet tennis team visits Hawaii, a young female star decides to defect in order to be with her American boyfriend. What she doesn't know is that just before she made a break for it, one of her teammates brained a KGB man with a wrench over a diamond-smuggling operation, and now both she and her boyfriend are patsies in the murder and face far sterner justice than Hawaii can offer if they are captured.
- A school for wayward girls, run by a friend of Steve McGarrett's, needs $15,000 for overdue taxes or the school will be closed. Former counterfeiter Willie McFee, a flower breeder who also is a general handyman and gardener for the school, decides to make one last print run with a set of near-perfect $20 plates he once crafted - but a mainland crime boss gets word that Willie's plates have surfaced, meaning that he can try to steal them for himself.
- Four stabbings have taken place in Honolulu, but Five-O hasn't been able to come up with anything linking the victims, or any consistent pattern among the killings except the murder weapon used. Then McGarrett is unexpectedly visited by Agnes DuBois, a young Englishwoman whose profession is preparing horoscopes. She claims that all of the victims shared certain astrological characteristics. Though McGarrett and the other members of Five-O are initially skeptical, they become intrigued when she correctly predicts the time and place of a fifth murder.
- Two men kidnap a young girl and hole up in a World War II bunker on Diamond Head. McGarrett and his men must rescue the child from the desperate criminals.