The Adventures of Jimmy Neutron: Boy Genius follows Jimmy Neutron, his faithful robotic dog, Goddard, and his eclectic friends and family as they experience life in Retroville. Jimmy is a typical kid, who just happens to be a genius. He creates gadgets to improve his everyday life, but his inventions go awry more often than not, and hilarious trouble ensues.
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! Inventions: MircoViewer 3000, Neutronic Eye in the Sky, Pant Eliminator, Smart Pants (nanochip), Laundroton, Neutron Catastrophic Simulation Escape System (Robo-Walker).
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. Inventions: Book Gum, Willy Loman 3000.
Jimmy, fed up with being an only child, invents his very own little brother, Brobot. Although at first he is happy with the results, Jimmy's actions soon backfire when Brobot steals the attention of Jimmy's friends and family.
Jimmy brings Thomas Edison to the present using his Time Pincher. But the future of western civilization is threatened when Edison falls in love with Miss Fowl and refuses to return to his own time!
Jimmy's Granny comes to stay while Judy and Hugh are off on a third honeymoon. Jimmy, concerned by her ailing health, gives her his new youth tonic. However, the potion works too well - Granny ends up as a talking baby!
Through the wonder of time travel; Jimmy goes 15 years into the past to a time when his parents were swinging sweethearts. Jimmy's investment tip changes the future so that the Neutrons become fabulously rich - but with unintended consequences!
Jimmy, Cindy, Carl, and Sheen take to the seas in search of treasure for their oceanography project.
Carl's sleeping problems are hindering Jimmy's scientific research, so Jimmy goes into Carl's dream to see what the problem is.
On an incredibly hot summer day, Jimmy tries to do Retroville a favor by blocking out the sun with quantumly enhanced sun block. But, as usual, things don't quite turn out the way the boy genius planned.
Jimmy, Carl, and Sheen form a band for the Talent Contest. Instead of focusing on their music, however, they focus on becoming rock stars - threatening their performance and friendship.
After a humiliating defeat by Cindy in the school relay race, Jimmy improves his shoes so he can run at the speed of light! Unfortunately, he gets stuck in this super-fast mode. Unless he finds a way to slow down, he will disappear – for good.
While Jimmy is using his mind-reading device on Cindy, their personalities are accidentally switched. Jimmy (in Cindy's body) and Cindy (in Jimmy's body) take advantage of this mistake, embarrassing each other to no end.
At school, Nick tells a scary tale about the Phantom of Retroland, a monster that lives at the local amusement park. In the interest of science, Jimmy sets out to disprove this urban myth with the help of his reluctant friends Carl and Sheen.
A teleporting accident leads to Jimmy switching bodies with Carl's hamster, Mr. Wuggles.
When the old tyrant of a hall monitor moves to Greece, Jimmy is chosen as his replacement. At first, he hates the job. But the power goes to his head, and he vows to "bring Lindbergh Elementary into the new century and beyond," becoming worse than the old hall monitor. Inventions: Hall Pass Authenticator, ID & Background Check Scanner.
Jimmy wants that new chemistry set in the worst way. But rather than wait for his birthday to come around, he hypnotizes his parents to think that tomorrow is his birthday. This plan works well - too well. Hugh and Judy think that every tomorrow is Jimmy's birthday, and our boy genius finds himself in trouble once again.
Jimmy determines to create a perfect snack: sour, creamy, sweet, chewy, etc. - all at once! When he finally gets the formula right, the snack turns out to be too perfect ... and everyone in Retroville becomes hopelessly addicted to it!
During Botany class, Miss Fowl accidentally swallows a seed from Jimmy's DNA-accelerated spinach plant. This has the unforeseen consequence of turning her into a 50-foot plant creature that threatens the citizens of Retroville.
Inventions: ElectroMagnetic Radiation Multiplier, Hieroglyphics Translator, DNA Accelerator, Toaster Window Washer, Toaster Newspaper Deliverer, Toaster Make-Up Applier.
A bully has been giving Jimmy a rough time recently, and he's had it. Rather than go to the proper authorities, Jimmy creates an electronic bodyguard piloted by Nanobots. The Nanobots get a little overzealous, though, and the Jim-Tech doesn't help Jimmy's situation much.
Inventions: the Jim-Tech & Nanobots.
Sheen's oldest and most prized UltraLord is missing! It's up to Jimmy, playing a high-tech Sherlock Holmes, to find it.
Inventions: UltraShock Dance Teacher 8000, Neutra-Scope.
Jimmy creates a Sick Patch to make him and his classmates get sick and stay out of school. But when the Sick Patch dissolves into the kids' skin, Jimmy has to go inside Carl to track down the germ and make a vaccine.
Invention: Neutronic 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?
Invention: Neutron Camp-In-A-Box.
Party at Neutron's 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?
Invention: Time Accelerator.
Jimmy's new invention lets you actually be a player in your favorite video game! Sheen enters UltraLord Versus Robo-Fiend and is later joined by Jimmy. But when Carl enters in Llamapalooza, Jimmy's faced with the problem of getting them all back into the real world.
Invention: Neutronic Game Pyramid.
Broadcast Blues: Jimmy lands the spot of host on Lindbergh Elementary's Public Access show! When the show fails miserably, Cindy and Libby are brought in as producer and co-star, changing informative Science With Jimmy to flashy Funky Jam Dance Party (with some science).
Inventions: Gravitrax SK30, AccoustaVac.
The bad Professor Finbarr Calamitous, who can never finish anything, plots to take over Retroville, with some help from its resident boy genius.
Invention: Swiss Army Laser.
It's time for the Parent-Child Picnic Games at Lindbergh Elementary - and the Vortexes always win. Since Jimmy doesn't think Hugh has what it takes to beat Cindy and her mom, he invents a headband to scientifically bring his dad's performance levels up past human standards.
Invention: "...corrective electromagnetic cranial band." (Hugh's headband)
Jimmy is hosting a sleepover with Carl and Sheen! To make it the best slumber party in history, Jimmy invents a machine to make perfect pillows for pillow fights, create made-to-order pizzas, and tell scream-your-head-off scary stories. But what happens if the invention is overloaded and the programs mix up?
Invention: Slumbertron 9000.
The Father's Day talent show is only a few days away, and Jimmy has to perform with his Dad. Hugh can't wait for the big night. Jimmy, on the other hand, is afraid of being disgraced in front of the entire school. Sure he loves his dad, but why must Hugh be so dorky and un-cool? So Jimmy invents a device that will alter Hugh's personality, making him the coolest dad in Retroville. The invention's a success. Hugh is so cool he becomes a huge celebrity. But now this new-and-improved Hugh is too cool to spend time with his son. Jimmy must now come up with a last minute solution that will turn Hugh back into the dad he loves.
Inventions: Neutronic De-dorkenator, mirco-fiber-optic tether net.
Jimmy, Carl, Sheen, Cindy, Libby, and Goddard blast off into space in Jimmy's newly invented spaceship to mine for aster-rubies while fighting off space bandits and their own greed. Inventions: the Jimbus, Chip.
Jimmy invents the Quantum Replay 9000 which enables him to go back in time. When Hugh gets a hold of it, he accidentally sends Jimmy, Carl and Sheen back 200 million years. Now Jimmy has to figure out how to get back while staving off a rampaging T-Rex.