 | Greg Morris | ... | Barney Collier (169 episodes, 1966-1973) |
 | Bob Johnson | ... | Voice on Tape (158 episodes, 1966-1973) |

| Peter Lupus | ... | Willy Armitage (157 episodes, 1966-1973) |
 | Peter Graves | ... | James Phelps (143 episodes, 1967-1973) |
 | Barbara Bain | ... | Cinnamon Carter (77 episodes, 1966-1969) |

| Martin Landau | ... | Rollin Hand / ... (76 episodes, 1966-1969) |

| Leonard Nimoy | ... | Paris / ... (49 episodes, 1969-1971) |

| Lynda Day George | ... | Lisa Casey (41 episodes, 1971-1973) |
 | Steven Hill | ... | Daniel Briggs (28 episodes, 1966-1967) |

| Lesley Ann Warren | ... | Dana Lambert (23 episodes, 1970-1971) |

| Sam Elliott | ... | Doug Robert (13 episodes, 1970-1971) |

| Jack Donner | ... | Buccaro / ... (11 episodes, 1966-1973) |
 | Arline Anderson | ... | Receptionist / ... (11 episodes, 1967-1973) |

| Sid Haig | ... | Musha / ... (9 episodes, 1966-1970) |
 | Lee Duncan | ... | Barney's Double / ... (9 episodes, 1968-1971) |

| Lee Meriwether | ... | Tracey / ... (8 episodes, 1969-1970) |
 | Barbara Anderson | ... | Mimi Davis (7 episodes, 1972-1973) |
 | Tony Giorgio | ... | Foyer Guard / ... (7 episodes, 1969-1971) |
 | George Sawaya | ... | Guard / ... (7 episodes, 1966-1972) |
 | Joseph Ruskin | ... | King Ibn Borca / ... (6 episodes, 1966-1972) |
 | Allen Joseph | ... | Bartender / ... (6 episodes, 1966-1972) |
 | Josh Adams | ... | House guard / ... (6 episodes, 1966-1970) |
 | Arthur Batanides | ... | Father Paolo Dominguin / ... (6 episodes, 1967-1972) |

| John Vernon | ... | General Ramon Sabattini / ... (6 episodes, 1969-1972) |
 | Vic Perrin | ... | Cheever / ... (6 episodes, 1967-1970) |
 | Tom McDonough | ... | Agent #7 / ... (6 episodes, 1970-1972) |
 | Jacques Denbeaux | ... | Reporter #1 / ... (6 episodes, 1967-1969) |
 | David Sheiner | ... | Colonel Ziegler / ... (6 episodes, 1967-1971) |
 | Bob Bralver | ... | Cell Guard #2 / ... (6 episodes, 1969-1971) |
 | George P. Wilbur | ... | Phelps' Double / ... (6 episodes, 1969-1973) |

| Charlie Picerni | ... | Border Guard / ... (6 episodes, 1968-1973) |
 | Marco López | ... | Agent - Hotel / ... (6 episodes, 1968-1971) |
 | Dick Ziker | ... | Brocke's Double / ... (6 episodes, 1969-1973) |
 | Albert Paulsen | ... | Albert Zembra / ... (5 episodes, 1966-1970) |
 | Joe Maross | ... | Clegg / ... (5 episodes, 1967-1973) |
 | William Wintersole | ... | Captain / ... (5 episodes, 1966-1971) |
 | Joseph Breen | ... | Chauffeur / ... (5 episodes, 1966-1970) |
 | Bart La Rue | ... | Agent #6 / ... (5 episodes, 1969-1972) |
 | Lou Robb | ... | Clerk / ... (5 episodes, 1967-1969) |
 | Robert Phillips | ... | Ernie Staczek / ... (5 episodes, 1967-1972) |
 | Anthony Zerbe | ... | Colonel Alex Vorda / ... (5 episodes, 1967-1971) |
 | Robert Ellenstein | ... | Deputy Premier Voss / ... (5 episodes, 1969-1972) |
 | Barry Atwater | ... | Dr. Carlos Enero / ... (5 episodes, 1966-1973) |
 | Milton Selzer | ... | Dr. Erich Rojak / ... (5 episodes, 1967-1972) |
 | Ivor Barry | ... | Chief Inspector Banco / ... (5 episodes, 1967-1972) |
 | Nate Esformes | ... | Captain Vicente Barrera / ... (5 episodes, 1968-1972) |
 | Peter Kilman | ... | Stephan's Guard / ... (5 episodes, 1970-1971) |
 | Socrates Ballis | ... | Sheikh / ... (5 episodes, 1967-1969) |
 | Paul Stevens | ... | Frank Wayne / ... (5 episodes, 1967-1971) |
 | Percy Rodrigues | ... | Jara / ... (4 episodes, 1966-1970) |
 | Mark Lenard | ... | Aristo Skora / ... (4 episodes, 1966-1970) |
 | Michael Strong | ... | Barsky / ... (4 episodes, 1967-1970) |
 | Biff Elliot | ... | Kid Wilson / ... (4 episodes, 1967-1972) |
 | William Windom | ... | Alex Cresnic / ... (4 episodes, 1967-1973) |
 | Warren Stevens | ... | Karl de Groot / ... (4 episodes, 1967-1972) |
 | Logan Ramsey | ... | Colonel Vargas / ... (4 episodes, 1969-1970) |
 | Antoinette Bower | ... | Amara / ... (4 episodes, 1967-1971) |
 | Russ Conway | ... | Civillian / ... (4 episodes, 1968-1972) |
 | Todd Martin | ... | Captain Ionescu / ... (4 episodes, 1966-1972) |
 | Thomas A. Geas | ... | Vince / ... (4 episodes, 1968-1971) |
 | Robert Conrad | ... | Bobby / ... (4 episodes, 1968-1972) |
 | John Rose | ... | Upstairs Officer / ... (4 episodes, 1969-1970) |
 | Fritz Weaver | ... | Emil Skarbeck / ... (4 episodes, 1966-1971) |
 | Pernell Roberts | ... | Boomer / ... (4 episodes, 1967-1973) |
 | Jason Evers | ... | Ben Nelson / ... (4 episodes, 1969-1973) |
 | Harry Davis | ... | General Zagin / ... (4 episodes, 1966-1969) |
 | Ron Feinberg | ... | Alvin Taylor / ... (4 episodes, 1970-1973) |
 | Leonard Stone | ... | Major Alud / ... (4 episodes, 1966-1972) |
 | Will Kuluva | ... | Anton Malta / ... (4 episodes, 1968-1972) |

| Val Avery | ... | Al Ross / ... (4 episodes, 1968-1972) |
 | Fred Villani | ... | First Reporter / ... (4 episodes, 1966-1969) |
 | John Crawford | ... | Art Warner / ... (4 episodes, 1967-1972) |
 | Alfred Shelly | ... | Guard #1 / ... (4 episodes, 1967-1969) |
 | Dal Jenkins | ... | Rousek / ... (4 episodes, 1969-1970) |
 | Alfred Ryder | ... | Colonel Borodin / ... (4 episodes, 1968-1971) |
 | Richard Angarola | ... | Atak Hajii / ... (4 episodes, 1966-1971) |
 | Ray Baxter | ... | Alexander Ventlos / ... (4 episodes, 1967-1969) |

| H.M. Wynant | ... | Lorkner / ... (4 episodes, 1969-1972) |
 | Joseph Reale | ... | Prince Stephan / ... (4 episodes, 1969-1970) |
 | Bob Golden | ... | Customs Man / ... (4 episodes, 1970-1972) |

| Nehemiah Persoff | ... | Igor Stravos / ... (3 episodes, 1966-1969) |
 | David Opatoshu | ... | Ahmed Vassier / ... (3 episodes, 1967-1970) |
 | Lloyd Bochner | ... | General Oliver Benjamin Hammond / ... (3 episodes, 1969-1972) |
 | Joe De Santis | ... | Jorge Cabal / ... (3 episodes, 1967-1970) |
 | Larry Linville | ... | Alexi Silensky / ... (3 episodes, 1969-1970) |

| Noah Keen | ... | Androv / ... (3 episodes, 1967-1969) |
 | Wesley Lau | ... | Dr. Thorgen / ... (3 episodes, 1969-1972) |

| Joe E. Tata | ... | Al / ... (3 episodes, 1966-1972) |
 | Peter Coe | ... | Kramer / ... (3 episodes, 1967-1969) |
 | Aaron Fletcher | ... | Desk Clerk / ... (3 episodes, 1967-1970) |

| Shepherd Sanders | ... | Convict / ... (3 episodes, 1967-1970) |
 | Richard Devon | ... | Hank / ... (3 episodes, 1966-1972) |
 | Noel Harrison | ... | Nicolai (3 episodes, 1970) |
 | John Colicos | ... | Chief of Internal Security Manuel Ferrar / ... (3 episodes, 1967-1970) |
 | Donnelly Rhodes | ... | Joel Morgan / ... (3 episodes, 1968-1972) |
 | Michael Tolan | ... | Ismet El Kabir / ... (3 episodes, 1968-1970) |
 | Michael Baseleon | ... | Detective Lieutenant Rab / ... (3 episodes, 1970-1971) |
 | Diane Baker | ... | Francesca (3 episodes, 1970) |
 | Curt Lowens | ... | Captain Stevya / ... (3 episodes, 1966-1969) |
 | Vince Howard | ... | Lt. Don Eckhart / ... (3 episodes, 1968-1972) |
 | Kevin Hagen | ... | Dave Klinger / ... (3 episodes, 1968-1971) |
 | Oscar Beregi Jr. | ... | Commandant / ... (3 episodes, 1966-1973) |
 | Richard Bull | ... | Dr. Laurence / ... (3 episodes, 1967-1971) |
 | Gregory Sierra | ... | Butler / ... (3 episodes, 1970-1972) |
 | Marcel Hillaire | ... | Bishop (3 episodes, 1970) |
 | Max Kleven | ... | Guard #2 / ... (3 episodes, 1966-1969) |
 | Erik Holland | ... | Announcer / ... (3 episodes, 1969-1971) |
 | Glenn R. Wilder | ... | Henzel / ... (3 episodes, 1971-1972) |
 | Marjorie Bennett | ... | Woman (3 episodes, 1970) |
 | Steve Ihnat | ... | Colonel Alex Stahl / ... (3 episodes, 1967-1969) |

| Peter Mark Richman | ... | Dr. Hargreaves / ... (3 episodes, 1970-1972) |
 | Lawrence Dane | ... | Commandante Juan Acero / ... (3 episodes, 1967-1971) |
 | Vincent Gardenia | ... | Vito Lugana / ... (3 episodes, 1967-1968) |
 | Rudy Solari | ... | Broyles / ... (3 episodes, 1968-1972) |
 | Barry Cahill | ... | Arnold Gates / ... (3 episodes, 1966-1972) |

| Frank Farmer | ... | Driscoll / ... (3 episodes, 1971-1973) |
 | Makee K. Blaisdell | ... | Guard / ... (3 episodes, 1966-1970) |
 | Mort Mills | ... | Al Souchek / ... (3 episodes, 1967-1972) |
 | Pepe Callahan | ... | Bartender / ... (3 episodes, 1969-1973) |
 | David M. Frank | ... | Reporter #2 / ... (3 episodes, 1969-1972) |
 | Martin Ashe | ... | Clerk / ... (3 episodes, 1970-1973) |
 | Barry Russo | ... | Cabot / ... (3 episodes, 1966-1971) |
 | Walter Mathews | ... | Lew / ... (3 episodes, 1966-1968) |
 | Walter Alzman | ... | Elevator Guard / ... (3 episodes, 1968-1969) |
 | Don Gazzaniga | ... | Belkin / ... (3 episodes, 1971-1973) |
 | Valentin de Vargas | ... | Luis Corba / ... (3 episodes, 1966-1971) |

| Jon Cedar | ... | Second Guard / ... (3 episodes, 1966-1968) |
 | Paul Lukather | ... | Lieutenant / ... (3 episodes, 1967-1969) |
 | Ed McCready | ... | Inspector / ... (3 episodes, 1967-1968) |

| Conrad Bachmann | ... | Cashier / ... (3 episodes, 1970-1973) |
 | Walker Edmiston | ... | Dave Rawls / ... (3 episodes, 1972-1973) |

| Michael Masters | ... | Gate Guard / ... (3 episodes, 1968-1972) |
 | George Sperdakos | ... | Dr. Dromm / ... (3 episodes, 1968-1969) |
 | Roberto Contreras | ... | Captain Avila / ... (3 episodes, 1969-1972) |
 | Gene Tyburn | ... | Ralph Robertson / ... (3 episodes, 1970-1971) |
 | Fred Krone | ... | Cell Guard #1 / ... (3 episodes, 1967-1972) |
 | Tommy J. Huff | ... | Boxer / ... (3 episodes, 1968-1970) |
 | Victor Paul | ... | Chauffeur / ... (3 episodes, 1968-1970) |
 | Dick Dial | ... | Bauer / ... (3 episodes, 1966-1970) |
 | Norbert Siegfried | ... | Officer / ... (3 episodes, 1966-1968) |
 | Eddie Paskey | ... | Steve / ... (3 episodes, 1966) |
 | Charles Napier | ... | First Guard / ... (3 episodes, 1968-1972) |
 | George Washburn | ... | Reporter / ... (3 episodes, 1968-1969) |
 | Craig Chudy | ... | Guard / ... (3 episodes, 1969-1971) |

| George Fisher | ... | Major Strat / ... (3 episodes, 1969-1970) |
 | William Visteen | ... | Maintenance Room Officer (3 episodes, 1970) |
 | Douglas Henderson | ... | Anders / ... (3 episodes, 1971-1972) |
 | William Smith | ... | Dekker / ... (3 episodes, 1971-1972) |
 | Larry Watson | ... | Contact / ... (3 episodes, 1971-1972) |

| Joanna Cassidy | ... | Stewardess / ... (3 episodes, 1972-1973) |
 | Bradford Dillman | ... | Larry Edison / ... (2 episodes, 1968-1972) |
 | Fernando Lamas | ... | Ramon Prado / ... (2 episodes, 1968-1970) |
 | Lou Antonio | ... | Robert Siomney / ... (2 episodes, 1970-1972) |

| Mary Ann Mobley | ... | Crystal Walker (2 episodes, 1966) |
 | Joseph Campanella | ... | Captain Miklos Cherno / ... (2 episodes, 1967-1968) |
 | James Daly | ... | Alfred Belzig / ... (2 episodes, 1967) |
 | Alf Kjellin | ... | Carl Vandaam / ... (2 episodes, 1968-1969) |
 | Ron Randell | ... | Charles Buckman (2 episodes, 1968) |
 | Nico Minardos | ... | Andre Malif / ... (2 episodes, 1966-1970) |

| William Smithers | ... | Frank Egan / ... (2 episodes, 1966-1968) |
 | Gunnar Hellström | ... | Frederick Rudd / ... (2 episodes, 1967-1969) |
 | Malachi Throne | ... | Ambassador Brazneck / ... (2 episodes, 1967-1969) |
 | Alan Bergmann | ... | Colonel Antoine Benet / ... (2 episodes, 1970-1972) |

| Bruce Glover | ... | Ernst Bandar / ... (2 episodes, 1970) |
 | Cyril Delevanti | ... | Cardinal Anton Vossek / ... (2 episodes, 1966) |
 | John Dehner | ... | Dan Whelan (2 episodes, 1968) |
 | Davis Roberts | ... | Anton Bouchet / ... (2 episodes, 1967-1970) |
 | Émile Genest | ... | Dr. Kronen / ... (2 episodes, 1967-1968) |
 | Eddie Ryder | ... | Joe Logan / ... (2 episodes, 1968-1972) |
 | Ken Swofford | ... | Deputy Mayor Charles Peck / ... (2 episodes, 1970-1971) |
 | Frank Christi | ... | Ben Murdock / ... (2 episodes, 1972) |
 | Sugar Ray Robinson | ... | Wesley (2 episodes, 1968) |
 | Jan Merlin | ... | Captain Danko / ... (2 episodes, 1969-1971) |
 | Khigh Dhiegh | ... | General Wo / ... (2 episodes, 1969-1970) |
 | Vincent Van Lynn | ... | Kutzof / ... (2 episodes, 1966-1969) |
 | Ben Wright | ... | Dr. Irving Berman / ... (2 episodes, 1967-1969) |
 | Claude Woolman | ... | Paul von Schneer / ... (2 episodes, 1967-1968) |
 | Booth Colman | ... | Dr. Huss / ... (2 episodes, 1967-1970) |
 | Julian Burton | ... | Captain Heindorf / ... (2 episodes, 1967) |

| Paul Marin | ... | Clerk / ... (2 episodes, 1969-1972) |
 | Scott Walker | ... | Chief Security Guard / ... (2 episodes, 1969-1971) |
 | Gene Dynarski | ... | Kutler / ... (2 episodes, 1966-1967) |
 | Jon Lormer | ... | Charles Gant / ... (2 episodes, 1968-1969) |

| Lee Paul | ... | Gristin / ... (2 episodes, 1971-1972) |

| Steven Marlo | ... | Diego / ... (2 episodes, 1967-1968) |
 | Steve Franken | ... | Akim Hadramut (2 episodes, 1967) |
 | Ron Rich | ... | Richy Lemoine (2 episodes, 1968) |
 | Jock Gaynor | ... | Cliff / ... (2 episodes, 1970-1972) |
 | Joel Lawrence | ... | Carter / ... (2 episodes, 1969) |
 | Russell Thorson | ... | Chief Danby / ... (2 episodes, 1971) |
 | Monte Markham | ... | Tosk (2 episodes, 1966) |
 | David Mauro | ... | Prince Fasar (2 episodes, 1967) |
 | Albert Carrier | ... | Captain / ... (2 episodes, 1968-1970) |
 | Peter Hellman | ... | Guard / ... (2 episodes, 1968) |
 | Wayne McLaren | ... | Artie Calvitos (2 episodes, 1968) |
 | Peter Brocco | ... | Dr. Valari / ... (2 episodes, 1970) |
 | Conrad Parham | ... | Airline Clerk / ... (2 episodes, 1970) |
 | George Perina | ... | Mosnyevov / ... (2 episodes, 1968-1969) |
 | Dom Tattoli | ... | Presidente Adolfo Rojas (2 episodes, 1970-1971) |
 | Ford Lile | ... | Pusher / ... (2 episodes, 1970) |
 | Paul Sorensen | ... | First Floor Guard / ... (2 episodes, 1967-1972) |
 | Peter Lorre Jr. | ... | Kadi (2 episodes, 1967) |
 | Joey Giambra | ... | Stevens (2 episodes, 1968) |
 | James Sikking | ... | Corrigan / ... (2 episodes, 1970-1972) |
 | Allen Bleiweiss | ... | Lukowski (2 episodes, 1967-1968) |
 | Jimmy Gambina | ... | Trainer (2 episodes, 1968) |
 | Jason Heller | | (2 episodes, 1970) |
 | Jimmy Lennon Sr. | ... | Announcer (2 episodes, 1968) |
 | Lee Grossman | ... | Referee (2 episodes, 1968) |
 | Angus Duncan | ... | Stan (2 episodes, 1968) |
 | John Larch | ... | Larry Gault / ... (2 episodes, 1970-1972) |
 | Eric Braeden | ... | Andrei Fetyakov / ... (2 episodes, 1966-1967) |
 | David Hurst | ... | Dr. Oswald Beck / ... (2 episodes, 1967-1969) |
 | Luke Askew | ... | Dawson / ... (2 episodes, 1968-1973) |
 | Victor French | ... | Leduc / ... (2 episodes, 1968-1971) |
 | Gerald S. O'Loughlin | ... | Bert Gordon / ... (2 episodes, 1968-1971) |
 | Don Francks | ... | Major Alex Denesch / ... (2 episodes, 1968-1969) |
 | Julie Gregg | ... | Anna Kerkoska / ... (2 episodes, 1969-1970) |
 | James Patterson | ... | Johnny Costa / ... (2 episodes, 1969) |
 | Arthur Franz | ... | Dr. Adler / ... (2 episodes, 1970-1972) |

| Barbara Luna | ... | Elena Maria Del Barra / ... (2 episodes, 1966-1969) |
 | Lee Bergere | ... | Alfred Kuderlee / ... (2 episodes, 1967-1969) |
 | Torin Thatcher | ... | Archbishop Djelvas / ... (2 episodes, 1968-1969) |
 | James McCallion | ... | Green / ... (2 episodes, 1969-1972) |
 | Robert Yuro | ... | Arnie / ... (2 episodes, 1969-1971) |
 | Lloyd Battista | ... | Chief of Police Francisco Diaz / ... (2 episodes, 1969-1970) |
 |