Season 3
Episode Guide
Attack of the Twonkies
S3
E1
Nov 11, 2004
Jimmy returns from an excavation on the Twonkus-3 comet with a small furry creature burrowed in his soil samples that have a rather violent reaction to music.
The N Men
S3
E2
Nov 27, 2004
After a run in with a radiation belt in outer space, Jimmy, Cindy, Carl, Sheen and Libby are all endowed with super powers.
Lights! Camera! Danger!
S3
E3
Nov 27, 2004
The famous film director, Quintin Smithee is coming to Retroville to make his next big movie, and Jimmy, Cindy, Libby, Sheen and Carl all have starring roles.
Fundemonium
S3
E4
May 24, 2005
Jimmy's dad loses his job at the now defunct automotive plant which means that the Neutrons may have to move to a new town. As a last-ditch effort to keep the family in Retroville, Hugh applies for a job as a toy inventor.
Stranded
S3
E5
May 26, 2005
After a hovercraft accident in the middle of the ocean, Jimmy and Cindy find themselves stranded on a deserted island.
Jimmy Goes to College
S3
E6
May 27, 2005
Jimmy is recruited by the most prestigious science college in the country to be their new superstar student. But when he gets there, Jimmy becomes the unwitting target of rival student, Seymour Nimmelfarb.
The Tomorrow Boys
S3
E7
May 23, 2005
Jimmy and the boys use Jimmy's latest invention to travel into the future to discover that the entire town has fallen under the totalitarian rule of Libby.
The League of Villians
S3
E8
Jun 18, 2005
King Goobot has organized the most diabolical collection of bad guys to ever assemble on one space station. Their mission: Get Jimmy Neutron.
Clash of the Cousins/Who's Your Mommy
S3
E9
Jun 20, 2005
The Neutron family has gathered to celebrate Aunt Maybelline's birthday. When Jimmy's present explodes, everyone suspects him of fowl. On a trip to Planet Schmengy, a strange alien substance attaches itself to Carl's face.
My Big Fat Spy Wedding
S3
E10
Jul 22, 2005
Jimmy learns that Jet Fusions is marrying Beautiful Gorgeous, much to his horror.
Crouching Jimmy, Hidden Sheen
S3
E11
Nov 18, 2005
In Retroville, Sheen is just an average hyperactive kid. But in Shangri Llama he is known as The Chosen One, or One Who Puts Foot Behind Head.
The Incredible Shrinking Town
S3
E12
Jan 23, 2006
When the entire population of Retroville is accidentally hit by Jimmy's shrink ray, the Space Bandits abduct everyone with the nefarious plan of marketing and selling them throughout the galaxy as living dolls.
One Of Us/Vanishing Act
S3
E13
Jan 24, 2006
A new TV show turns everyone in Retroville into mindless and exceedingly cheerful zombies. To impress Betty Quinlin, Jimmy performs a magic show using a cheap magic kit that's full of his own technological upgrades.
Jimmy/Timmy Power Hour 2: When Nerds Collide
S3
E14
Jan 16, 2006
Jimmy Neutron and Timmy Turner vie against each other for Cindy's affections and Prof. Calamitous employs Cosmo and Wanda in his evil plans.
Trouble With Clones
S3
E15
Jan 25, 2006
After Cindy makes fun of Jimmy for not beating Leonardo da Vinci's invention record, Jimmy tracks down his evil clone once again and attempts to turn him good so he can act like him while Jimmy makes more inventions, but the clone has other ideas.
The Evil Beneath/Carl Wheezer, Boy Genius
S3
E16
Jan 26, 2006
Jimmy, Carl, and Sheen travel to the Bahama Quadrangle to solve the mystery behind it. Carl wants to impress his pen pal by pretending to be a genius and making Jimmy seem unintelligent in comparison to him.
Who Framed Jimmy?/Flippy
S3
E17
Jan 27, 2006
Jimmy is framed for a break in at the Retroville Bank. When Carl and Sheen attempt to free him from his incarceration, the three boys end up on a chain gang together.
How to Sink a Sub/Lady Sings the News
S3
E18
Nov 17, 2006
When Jimmy hides a time displacement device in the teachers' transportation to the annual education convention, the entire faculty of Lindberg Elementary is sent into temporary time limbo.
King of Mars
S3
E19
Nov 25, 2006
Eustace returns and plans to take over Mars, but Eustace redeems himself and joins forces with Jimmy and his friends.
Best In Show/El Magnifico
S3
E20
Nov 25, 2006
Goddard is disqualified from the Retroville Pet Show because he is not technically a real dog. Sheen's dad, Mr. Estevez desperately wants to impress his son.
Jimmy/Timmy 3: The Jerkinators!
S3
E21
Jul 21, 2006
Jimmy and Timmy are at it again: bickering over the affections of Cindy, but somehow end up fighting off enemies together!