Since Jimmy's a scientist, he has more important things to do than pick up his pants - like invent a device that will do that chore for him. But when the nanochip develops advanced cranial 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?
Birth of a Salesman
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, 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.
The Big Pinch
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!
Time is Money
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!
Raise the Oozy Scab
Jimmy, Cindy, Carl, and Sheen take to the seas in search of treasure for their oceanography project.
I Dream of Jimmy
Carl's sleeping problems are hindering Jimmy's scientific research, so Jimmy goes into Carl's dream to see what the problem is.
Jimmy on Ice
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.
Battle of the Bands
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.
See Jimmy Run
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.
The Phantom of Retroland
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.
My Son, the Hamster
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.
Hypno-Birthday to You!
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.
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.
Crime Sheen Investigation
Sheen's oldest and most prized Ultra-Lord is missing! It's up to Jimmy, playing a high-tech Sherlock Holmes, to find it.
Journey to the Center of Carl
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.
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?
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?
Jimmy's new invention lets you actually be a player in your favorite video game! Sheen enters Ultra-Lord 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.
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).
Professor Calamitous, I Presume
The bad Professor Finbar Calamitous, who can never finish anything, plots to take over Retroville, with some help from its resident boy genius.
The Yolkians have come to earth but this time they seek out only peace and brotherhood with the people of Retroville. But while they integrate themselves into society, Jimmy Neutron suspects the worst. Who could forget how the evil egg-shaped aliens tried to sacrifice the entire adult population of Retroville to the ravenous chicken god Poultra? Everyone apparently. Just when Jimmy is about to give in and make peace like everyone else, he discovers some evidence that reveals the Yolkian's true intentions.
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.
Sleepless in Retroville
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?
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.
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.
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.
Bored by a class documentary on mummies, Jimmy decides to take Carl, Sheen, Libby, and Cindy along with him to see the real deal. But when his Electro-Life gizmo accidentally brings the mummies to life, Jimmy's got to keep himself and his friends from becoming the latest addition to Queen Hazabataslapya's Tomb.
Songs: Unknown -- Egyptian Beach Party
The Retroville 9
Jimmy's determination to captain a winning baseball team leads him to rev up the equipment with Neutronic technology. When the team unexpectedly reaches the World Championship, Jimmy has a crisis of conscience.
Grumpy Young Men
Jimmy, Carl, and Sheen use Jimmy's Metabolic Accelerator so they can be old enough to buy a violent video game. The machine works a little too well, and the boys end up as senior citizens.
Jimmy thinks it's cool when he's recruited by a top-secret government agency to become a spy, but what's even more thrilling is joining forces with his action-hero movie idol Jet Fusion in an effort to save the world from a villainous professor.
Songs: Unknown -- He's a Spy Guy
Jimmy's Neutronic Monster-Maker transforms Sheen into a werewolf, Carl into a vampire, and Hugh into Frankenstein's monster. However, Jimmy's invention works too well, making those three real monsters! The little genius's Halloween is complicated when Carl and Sheen bite Cindy and Libby - now there are five monsters chasing him!
Jimmy, Sheen, Carl and Captain Betty set out on a mission to capture the lake monster that has haunted Lake Retroville for at least six months.
Jimmy For President
Jimmy, Sheen, Libby, and the new foreign-exchange student, Bolbi, run for class president. However, the first three candidates get swept up in their desire to win and use unfair tactics to influence Carl's vote. When the votes are tied and Carl must cast the deciding vote, he has a conflict of interest.
Jimmy tries to update those mischievous Nanobots to correct his non-scientific homework, but the Nanobots become obsessed with pleasing "The Great Creator" and start correcting everything.
Jimmy is convinced that Santa Claus does not exist. To prove his theory once and for all, Jimmy travels to the North Pole with Carl and Sheen. The boys find Santa's workshop, but Jimmy thinks it's just another toy factory. In fact, nothing they see convinces Jimmy otherwise. When his homing device accidentally emits a blast of energy to the source of the signal, Santa's atoms get scrambled. With Santa temporarily out of action, who can deliver the presents? Jimmy must now put his doubts aside, load up the hypercube, and try to save Christmas before the people of Retroville make up a new holiday.
Jimmy shows off his latest invention – a love pheromone – to Carl and Sheen. Anyone exposed to it will fall in love with the first person he or she sees. Jimmy thinks his potion is stored safely in the containment chamber, but Carl accidentally opens it – and love is literally in the air, exposing them all! And Cindy Vortex is the first girl Jimmy sees! Will Jimmy be able to reverse the effects of his latest invention, or will love conquer all?
Jimmy tries to stop Sheen from getting left back in school by turning his Brain Drain Helmet into a Brain Gain Helmet. However, his plan backfires when Sheen's I.Q. – as well as his head – inflates to a destructive degree.
MaternoTron Knows Best
MaternoTron Knows Best: Jimmy creates a robot to replace his vacationing mother, but when it becomes too controlling, will Judy come to the rescue in time?
Send in the Clones
When Jimmy's chores get in the way of him enjoying rare ice crystals from outer space, he hurriedly creates clones of himself. These clones, however, represent different parts of Jimmy's personality. What will happen when the clones are let loose in Retroville?
The Great Egg Heist
Jimmy helps Princess Guan Qi "Peggy" Tsu by retrieving the Egg-Drop Jade from the Retroville Museum before it is stolen by her evil brother.
Jimmy and Carl's dads are fighting and forbid their sons from speaking to one another, so Jimmy and Carl must find a way to end the feud and save their friendship.
Jimmy tries to impress Betty Quinlan by auditioning for the lead role in the school play, a musical entitled Mc Beth in Space. Though he loses the part to Nick, he jumps at the chance of doing the special effects. However, when Nick breaks his leg skateboarding, will Jimmy rise to the challenge, or let the play go up in smoke?
Jimmy, Sheen and Carl travel to the Moon to help Jimmy's robotic brother Brobot rescue his parents from The Junkman, an evil space scoundrel.
During a class trip to a rodeo, Jimmy, Carl and Sheen fall for a cute cowgirl, Sally. To prove themselves worthy of Sally's heart, each of the boys set out to master a specific rodeo talent. Sheen turns himself into a rodeo clown, and Carl wrestles a pig, but it's Jimmy who comes out the victor with his impressive bull riding – and fool proof robotic bull, of course. Once the bull malfunctions however, the boys need the help of a real cowboy to save the day. That cowboy, or cowgirl, turns out to be none other than Miss Fowl.
The Science Fair Affair!
Cindy leads a campaign to ban Jimmy from the school's science fair, citing unfair competition. But even an ousted Jimmy steals the spotlight when his patented oil-generating machine earns him a Nobel Prize for Science – then malfunctions and places everyone at the science fair in grave danger.
When Timmy Turner wishes he was in the greatest lab in the universe, he winds up in Jimmy Neutron's secret laboratory, and Jimmy is teleported to Dimmsdale. Jimmy happened to be giving Goddard an upgrade at the time, which Timmy interrupts, installing a violent video game into the dog's programming instead. Meanwhile, Jimmy inadvertently provides the means for Mr. Crocker to take over Fairy World.
To raise money for his inventions, Jimmy decides that he, Sheen, and Carl should get jobs. Skeet, employee of the month at McSpanky's, hires Sheen and Carl, but doesn't think Jimmy's the "McSpanky type," though he agrees to try Jimmy out. Jimmy, however, is not pleased with the brainless (and humiliating) work he has to do, so he takes it upon himself to show everyone what he's capable of - by bringing McSpanky's into the 21st century.
The Mighty Wheezers
When his parents go to the desert for a camp-out, Jimmy spends the weekend with the Wheezers. The aches, pains, and insane precautions the Wheezers take to protect their health, however, soon get to Jimmy. Thus, the boy genius sneaks back to his lab and creates health boost pills for the Wheezers. The pills work a little too well, though, and the Wheezers end up with almost super-human abilities! But the effects are only temporary, and they could wear off at any time..
Bilion Dollar Boy
After Jimmy beats the richest kid in Retroville, Eustace Strych, in the Battlekite Flyoffs, Eustace's pride is wounded. He sets up a trap for Jimmy by inviting Jimmy, Sheen, Carl, Cindy, Libby, Hugh, and - most importantly - Goddard over to his mansion. There, Hugh befriends Eustace's dad while the kids enjoy an ice cream banquet. Things turn dangerous, however, when Eustace engages Jimmy in a bet - Goddard against one of Eustace's RA multi-units. And if Eustace's robot wins, Jimmy will lose Goddard.
A strange meteor lands in Retroville, bearing a mysterious message in an alien language. When Jimmy is finally able to translate and answer the riddle, he, Cindy, Libby, Sheen, Carl, Bolbi, and Goddard are sucked into space - only to find that the message is an invitation to Intergalactic Showdown! Team Earth must learn to work together to win - or lose their home planet!
After a close call with a hostile alien life form on the comet Twonkus-3, Jimmy returns home only to find that a cute and cuddly alien has stowed away on his ship. Despite Jimmy's warnings about the dangers of keeping alien pets, the twonkies become huge hits, and soon everyone owns one. But when the twonkies undergo an unexpected mutation, they threaten to take over Retroville!
Jimmy and the gang enter a script-writing competition, where the winning script gets turned into a movie. Jimmy wins and the director decides to Carl, Sheen, Libby and Cindy in the movie.
On their way back from playing golf on Mercury, Jimmy and the gang inherit superpowers after being exposed to the Van Patten radiation belt.
Jimmy, Sheen, and Carl travel 15 years into the future, only to find that some things have gone wrong. Can they right the past to save their future?
-- Wasting All This Time!
After the car company Hugh works for decides they don't need his services anymore, the Neutrons are faced with the awful prospect of moving. To stay in Retroville, Hugh becomes a toy inventor, and the Nano-bots return again to wreak more havoc.
Who's Your Mommy?
On a return visit to Planet Smangy with Jimmy and Sheen, Carl comes into contact with an alien life form which impregnates him.
Clash of the Cousins
Jimmy's Great Aunt Amanda is having a birthday party, but things go horribly wrong when Baby Eddie tries to destroy them all for Aunt Amanda's money!
A trip gone wrong ends up turning even worse when Jimmy and Cindy get into an argument that winds up getting them stranded together.
Jimmy becomes frustrated at school when his scientific lecture is disregarded in favor of making macaroni sculptures. So, when Dean Cain, head of Pamona University, offers him a chance to enroll in that college to help them win a science grant, Jimmy eagerly accepts. He soon finds, however, that college is a completely different world from elementary school ... a much more challenging one. And when it comes to jealousy of Jimmy's knowledge, Cindy (left behind at Lindbergh Elementary) doesn't hold a candle to new classmate.
After being teased about being short, Jimmy accidentally shrinks the citizens of Retroville.
A kung-fu warrior wants to be The Chosen One in the temple of Shangri-Llama, but Sheen holds that position, with his ability to put his leg behind his head. So, the warrior kidnaps Libby in order to fight with Sheen and claim the title of "The Chosen One" as his own.
One of Us
Everyone in town gets hypnotized by a TV show to act "happy." Jimmy and Cindy have to put a stop to Grandma Tater's show before it's too late!
Jimmy tries to become a magician to impress Betty, but something goes horribly wrong, and he ends up transporting the group into alternate universes.
Evil Jimmy returns! Jimmy needs his evil clone to "be" him so he can up his invention output by staying in his lab while the clone goes to school and spends time with his friends and family, so he tries to make the clone a "Good Jimmy." Of course, things go wrong and Evil Jimmy wreaks havoc around town and creates a cloned Earth with a dark matter chip! Can Jimmy stop him before the real Earth disappears?
Carl Wheezer: Boy Genius
Carl asks Jimmy to help him pretend to be a genius, just for one day, in order to impress a girl names Elke. But Jimmy soon wishes he hadn't.
The Evil Beneath
Jimmy, Carl and Sheen set out to discover the mystery behind the Bahama Quadrangle. They are captured by a mad scientist (Dr. Sydney Moist) who wants to make them into slaves!
Who Framed Jimmy?
Someone's stolen a lot of money ... and the evidence points to Jimmy! Jimmy gets sent to jail for a crime he didn't commit, and soon, Carl and Sheen join him for trying to bust him out of jail. Can they find the real thief before they're locked away for good?
Hugh wants to become a ventriloquist, so Jimmy decides to give him a hand. But his modifications may cause a big problem for his father.
Eustace Strych is back, and he's still determined to humiliatingly defeat Jimmy. Now the race to find an energy source on Mars is on! Who will win? During the whole fiasco, Cindy tries to impress and get Jimmy's attention.
Mr. Estevez wants to impress his son, so he asks for Jimmy's help.
Best In Show
Jimmy enters Goddard in a dog show. Goddard easily wins, but he is soon disqualified for being robotic ... so the canine runs away to let Jimmy get a real dog.
Beautiful Gorgeous and Jet Fusion are getting married, but something doesn't seem right to Jimmy. He soon learns it's a ploy to get rid of him and Jet for good.
Songs: Unknown -- I have the ring, Unknown -- We all can sing
King Goobot has gathered up a team of villains comprising of Grandma Taters, The Junkman, Beautiful Gorgeous, Baby Eddie, Professor Calamitous, The Space Bandits and Eustace Strych. Their mission is to get Jimmy Neutron.
Timmy Turner travels to Retroville to ask Cindy to a dance. Jimmy also decides to ask Cindy! So the two battle it off to see who Cindy chooses. Also Professor Calamitous robs the Retroville bank and starts reeking havoc in Dimsdale and Retroville. Will Jimmy and Timmy be able to stop fighting in time to stop Professor Calamitous before he destroys the world? And who will Cindy choose?
How To Sink A Sub
Jimmy sends the teachers of Lindberg elementary away into space for a week. At first it's a blast for the students there but when Carl accidentally informs their parents they decide to take over the school.
Lady Sings The News
Jimmy, Carl and Sheen carry out a hilarious prank on the evening news. The next day Corky Shimazu comes to there school and gives them jobs on The Evening News. At first everything starts off okay but when Libby starts telling every one's secrets in her gossip segment, Da Word, they decide to come up with a plan to stop her before all of there secrets are revealed.
Jimmy and Timmy become crime fighting friends, with the combination of Jimmy's science and Timmy's magic they are unstoppable. There friends becomes so strong that it causes Jimmy to ignore his two best friends Sheen and Carl and it causes Timmy to ignore his two best friends Chester and Aj. They even ignore Cindy. The two then get tired of beating villains so they decide to create an ultimate villain so they can destroy.