Jimmy tries to disprove Nick's scary tale about the Phantom of Retroland.

Jimmy's teleporting goof-up leads to him switching heads with Carl's pet hamster.

To get revenge on Cindy for winning a race, Jimmy adapts his running shoes so he can move at lightning speed.

When the old tyrant of a hall monster leaves, Jimmy is picked as his replacement.

Jimmy, Carl and Sheen form a band in order to beat out Cindy and Libby for the talent contest first prize.

Miss Fowl swallows a seed from Jimmy's DNA-accelerated spinach plant turning her into a 50-foot plant.

To settle an argument with Cindy, Jimmy brings Thomas Edison to school.

Jimmy and Cindy are forced to collaborate on a science project involving hidden treasure.

In order to get his new chemistry set right away, Jimmy hypnotizes his parents.

Jimmy creates an electronic bodyguard to protect him from a bully.

Jimmy's attempt to cool off the summer heat wave results in a new Ice Age.

Since Jimmy's a scientist, he has more important things to do than pick up his pants - like invent a device that'll do that chore for him. But when the nanochip develops advanced brainial capacity, Jimmy's pants lead an attack on the city of Retroville!

Jimmy's Granny comes to visit and he gives her his new youth tonic potion.

Jimmy invents the Dream Injector 5000 and enters Carl's dream to figure out what he is afraid of.

In his lab, Jimmy constructs the perfect little brother he never had, "Brobot".

Jimmy comes up with a snack that is even tastier than everyone's favorite.

Jimmy is tired of being a genius, so he decides to drain his brain to normal capacity. But when a big meteor heads straight for Retroville, who will save the day?

Miss Fowl's class has a candy-selling contest, with the grand prize being a trip to Retroland! To beat Cindy in the contest, Jimmy invents a robot programmed to sell candy no matter what.

Jimmy goes 15 years into the past to a time when his parents were swinging sweethearts.

Jimmy comes up with an invention that allows him to read Cindy's mind.

Sheen's oldest and most prized UltraLord is missing! It's up to Jimmy, playing a high-tech Sherlock Holmes, to find it.

Jimmy creates a "get out of school sick" patch.

Hugh takes Jimmy, Sheen, and Carl on a camping trip into the wilderness, allowing no technology whatsoever. So what will save them when a big problem comes along?

Sheen and Carl convince Jimmy to throw a party when his parents go out to watch Ducks. But when Hugh and Judy come home early, how can Jimmy convince his guests to leave?

Jimmy uses his Neutronic Game Cube to send Sheen into his favorite Ultra Lord video game.