Jimmy creates a machine that zaps his intelligence away in order to fit in, while his missing brains are needed to stop a meteor aimed at Retroville./ Jimmy builds a candy selling robot salesman who won't take no for an answer.
Jimmy turns his babysitting Grandma into a toddler to avoid her elderly rants and rambles/ Jimmy goes back in time to convince his dad to invest in a successful fast food chain, making the family rich in the present.
Jimmy and his friends use a sub to find treasure hidden in an old, sunken ship somewhere on the ocean floor/Carl confronts his nightmares of the "terrible spooky thing" by allowing Jimmy to enter his dreams.
Jimmy attacks the earth's atmosphere with sun block to end Retroville's heatwave causing a second ice age instead. / Jimmy creates musical instruments that play based on thought waves to beat Cindy and Libby in a school talent show.
After consistently finishing last in his gym class races, Jimmy invents a pair of super fast running shoes until things get out of control/ Jimmy's new experiment goes horribly wrong causing him to switch bodies with Cindy.
A dare leads Jimmy and pals to stay over night at Retroland to prove once and fall all the existence of the park's phantom/ Not to dissimilar to 1958's 'The Fly', an accident rearranges the bodies and heads of Jimmy and Carl's pet hamster.
The Yolkians have come to earth, but this time they seek out only peace and brotherhood with the people of Retroville. While Jimmy Neutron suspects the worst, everyone in town is ready to forgive and forget.
Jimmy's newest invention lets Sheen actually be a player in his favorite video game! He enters UltraLord Versus Robo-Fiend and is later joined by Jimmy. But when Carl enters in Llamapalooza, Jimmy's faced with the real problem of getting them all back into the real world. Invention: Neutronic Game Pyramid.