Jimmy is convinced that Santa Claus does not exist. To prove his theory, he travels to the North Pole where he discovers a remote toy factory.

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 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.

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

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

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

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

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

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

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

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

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

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

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.

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

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

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

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

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

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?