- The Neutron family has gathered to celebrate Aunt Maybelline's birthday. When Jimmy's present explodes, everyone suspects him of fowl./On a trip to Planet Schmengy, a strange alien substance attaches itself to Carl's face.
- Who's Your Mommy: A mysterious alien gets attached to Carl during one of Jimmy's missions on a planet. Carl starts to develop unhealthy cravings and he acts hormonal. It is soon discovered the alien inside Carl is an alien jellyfish and the mother is looking for her missing child. Carl allows Shmengo to go home with his mother. Later on, Carl and his friends attend Shmengo's birthday party. Clash of the Cousins: Jimmy must attend his great aunt's birthday party with his family, but his aunt and family members aren't thrilled to have Jimmy attending the party because his inventions have caused more harm than good. Jimmy tries to get into his family's good graces by giving them gifts but it doesn't go as planned and Jimmy gets wrongfully blamed for his actions. Jimmy isn't allowed to attend the party and he has his friends interrogate his cousins to see if they are responsible for framing him, but Gomer and Annabelle are clean. It is soon discovered that Jimmy's baby cousin Eddie is responsible for framing him and he is an evil genius. Eddie plants Godard's battery onto his great aunt's cake, but Jimmy arrives to prevent anyone from getting killed. Jimmy is able to prove his innocence by planting an explosive device into Eddie's rattle, causing everyone to realize that Eddie is responsible for framing Jimmy. Eddie gets punished by his parents for the attempted murder on his great aunt and for incriminating Jimmy.—dawsonpersi
- Clash of the Cousins Jimmy and his parents go to the Neutron family reunion and Carl and Sheen tag along. Jimmy tries to give his relatives his inventions made in his lab, but they refuse, due to his inventions backfiring such as the walking pants or the Yolkians.
However, they finally accept his inventions, but they explode. Jimmy's baby cousin, Eddie then cries making Jimmy's parents and his relatives (except Gomer, Carl, Sheen and Goddard) believe that Jimmy is the one who destroyed their presents. Jimmy's angry parents and relatives send Jimmy in the house as punishment, even though he is innocent and he didn't do anything wrong. They don't believe him and Aunt Amanda then harshly tells him to take Goddard as well.
Jimmy does a DNA scan to figure out who could have made his presents explode with Gomer, Carl and Sheen helping him out. However, this all falls down to the baby, Eddie. The windows and the door shut tight and the room becomes dark. To their horror, Eddie cackles and traps Jimmy, Carl, Sheen and Gomer and in electrified fun rings. Baby Eddie then reveals his plan: to murder the whole family by placing a bomb in a cake the Neutron family will enjoy in the reunion and be rich with the Neutron's fortune and he locks Jimmy and the gang in his nursery room.
However, Jimmy and Goddard race outside just in time to remove the bomb before it explodes immediately! Jimmy and Eddie fight, but the family except for Gomer, Carl and Sheen get even MORE angry at Jimmy. However, Jimmy rigged Eddie's rattle to explode and Eddie angrily yells at Jimmy for his rattle exploding, thus talking in front of the entire family who are shocked by it. Eddie then realizes his cover has been blown says in a baby voice, "Goo" with twinkle eyes to cover up, but the family already heard him talk, Aunt Amanda calls Baby Eddie "A Bad Seed" and says that Jimmy is the good nephew. They finally discovered the truth, Jimmy tells his Aunt Kari to keep Eddie on a baby leash. Baby Eddie instead of Jimmy is now punished by his mother Kari for causing trouble and then vows to get revenge on Jimmy.
Jimmy's parents and relatives apologize to Jimmy for not believing him, congratulated Jimmy for saving the reunion and they continue to celebrate.
Who's Your Mommy This episode starts with Jimmy, Carl, Sheen and Goddard flying into a rocket into a planet called Shmengy trying to find Sheen's Ultra Lord action figure that he forgot the last time they were there.
Jimmy finds something that wasn't there last time, and asks Carl to scratch a sample of some human body-like part to get DNA samples as Jimmy was too nervous to do it. When Carl uses a knife on it, the body-like thing starts to move and spits out a scorpion-shaped alien which spreads all over Carl's face.
Jimmy, Carl and Sheen then go back down into Jimmy's lab to detect and remove what the scorpion-like thing was, don't letting Carl seeing it by saying that there's no mirrors in the lab. Jimmy then finds the solution on stripping off the scorpion-like alien. He uses two lasers to get it off and it works.
When the three were done removing the thing, Jimmy, Carl and Sheen go to the Candy Bar. But Jimmy and Sheen realize there's something wrong with Carl, as he was the only one eating and was eating weird food like vanilla ice cream with salmon, and strawberries. When Carl gets up, Jimmy and Sheen realize that Carl's butt is turning purple and a pink thing glowing in it. He then uses his gadgets and inventions to figure out what the glowing object in Carl's butt is. After figuring it out, Jimmy realizes that Carl has become pregnant with a baby alien after having that scorpion-like thing on his mouth.
Going to Carl's house, Jimmy asks Carl's dad if he could borrow Carl for a moment, but they were busy chatting about how cool it would be having a grandchild. Jimmy gets frustrated, so he brings Carl to the lab instantly.
Sheen tries to help Carl out by feeding him some more weird foods while Jimmy tries to come up with a cure. Carl then goes to Cindy's house to have help with this new baby alien he will about to give birth to later.
When Jimmy is just about ready to find a cure, a giant alien jellyfish thing comes to Retroville and starts taking all the power out of Retroville. Jimmy and Sheen bust into Cindy's house and tell Carl they need to hide him from the giant alien attacking Retroville. Sheen then pushes the three girls out of Cindy's house and acts crazy with Carl, while protecting him.
The giant alien shuts down Retroville by making the electricity run out entirely. Jimmy then runs to the power plant to regenerate the electricity so electricity waves would flow. The giant alien then follows the electricity waves, which is shown to be what attracts it. The scene goes back to Sheen being with Carl and when Carl hears that his baby is ready to be born, he goes outside and when Jimmy is about to try and stop the giant alien, Carl comes and tells him he knows what the alien wants. Carl then somehow releases the baby who looks just like the giant alien jellyfish, and is revealed to be called Shmengo. The two then fly off to their homeplanet while Carl says goodbye and hugs him.
One month later, Jimmy, Carl and Sheen go back to the planet to visit and celebrate Shmango's birthday, who has revealed to have two unnamed siblings and a mom were at his first birthday. Carl and Sheen hug Shmengo and become shocked by electricity, making Jimmy not want to even have a hug.
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