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Characters: The Adventures of Jimmy Neutron: Boy Genius
aka: The Adventures Of Jimmy Neutron

James "Jimmy" Isaac Neutron

Voiced by: Debi Derryberry

The main protagonist. He is a boy with a stunning IQ and a love for science.
  • Adorkable
  • Aesop Amnesia
  • Anime Hair: Lampshaded consistently.
  • Belligerent Sexual Tension: With Cindy.
  • Berserk Button: Do NOT give Jimmy an F. Denzel Crocker in the Jimmy Timmy Power Hour learns this the hard way.
  • Big Damn Heroes: ALL THE TIME. Often Lampshaded, in fact.
  • Big "NO!": In The Tomorrow Boys, after learning he gets married to Cindy. In a bit of Leaning on the Fourth Wall, the scream cuts to a commercial. When the show comes back on, Sheen comments that he had been screaming for four minutes straight.
  • Brilliant, but Lazy: Why do something as simple as neatly put away your piles of pants when you can implant chips in them that do it for you? Carl and Sheen call him out on this, though.
  • Butt Monkey
  • Cassandra Truth: In the episode, "The Eggpire Strikes Back", no one believes Jimmy when he says that the Yolkians, the villains from the pilot film, are still just as evil as ever.
  • Catch Phrase: Originally "Gotta blast!" "Think, think, THINK!" and "Brain blast!". The show eased off on these as it went on, eventually getting rid of them entirely. (One exception is "And now, my latest invention, the (insert plot-related-device here!)", which stayed for most of the series' run.)
  • Child Prodigy
  • Comic Trio: He's the straight man.
  • Crazy-Prepared: His watch, whose powers depend mainly on the plot. Can include lasers, freeze rays, magno-rays, GPS, tracking devices…you name it, there's probably a gadget for it tucked away in there.
  • Cross Dressing Voice
  • Deadpan Snarker:
    Jimmy: *science babble about a spider*
    Sheen: Fascinating! Can you make it do the hokey pokey?
    Jimmy: Sheen, go home.
  • Fatal Flaw: Jimmy's greatest flaws are a combo of Pride and his lack of common sense; in fact, many of the conflicts in the show are born out of this.
  • Future Loser: In the 'Bad Future' of The Tomorrow Boys, Future!Jimmy is a slack-jawed loser, wanted by the evil dictator Libby, with a five-o'clock shadow and Cindy as a wife. Current!Jimmy is less than impressed.
  • Gadgeteer Genius
  • He Cleans Up Nicely: When Jimmy shows up in a tux for Jet Fusion's wedding to Beautiful Gorgeous in My Big Fat Spy Wedding, Cindy promptly gets little hearts in her eyes.
    Cindy: "So Neutron's the best man? Yeah, more like the best NERD! I bet he'll look like a total…" (Jimmy shows up outside the church in a tux. Cue fade to pink background, eye-hearts and hair patting) "…HUNKMUFFIN."
    • Another example is during Love Potion #976-J, when Jimmy cleans up for his date with Cindy. Said almost word-for-word by Cindy.
  • "Hell Yes" Moment: Often. Especially when he's given up all hope…and then his friends forgive him for being arrogant/apologize for being stupid/come back to save him.
  • The Hero
  • Insufferable Genius: At times, but often more pronounced when Cindy's around.
  • Intelligence Equals Isolation
  • Kid Hero
  • Little Professor Dialogue: Justified partially in that he does actually have an IQ of 210.
  • Pet's Homage Name: Jimmy designed and built his robot dog and named him Goddard in honor of rocket science physicist and inventor Robert Goddard. Especially apt when, in his first animated feature film, Jimmy is able to ride upon Goddard like a space bike.
  • Puppy Love: With Cindy.
  • Ridiculously Successful Future Self: In the 'good future' of The Tomorrow Boys, Jimmy is the first person to ever win the Nobel Prize in bulk.
  • Rival Turned Evil: In The N-Men...
  • Science Hero
  • Sesquipedalian Loquaciousness: A frequent user and abuser.
  • Slap-Slap-Kiss: With Cindy. All the time.
  • The Smart Guy: Duh.
  • Took a Level in Dumbass: When he accidentally drained his brain too much in Normal Boy.
  • TV Genius

Carlton "Carl" Ulysses Wheezer

Voiced by: Rob Paulsen

Jimmy's shy, asthmatic best friend who has an unhealthy obsession with llamas and Jimmy's mom.

Sheen Juarrera Estevez

Voiced by: Jeffrey Garcia

Jimmy's hyperactive other best friend who is obsessed with the comic book superhero Ultra Lord.

Cynthia "Cindy" Aurora Vortex

Voiced by: Carolyn Lawrence

Jimmy's rival who has a crush on him. Not that she'll admit it.

Liberty "Libby" Danielle Folfax

Voiced by: Crystal Scales

Cindy's best friend.
  • Beta Bitch
  • Beta Couple: With Sheen.
  • Black Best Friend
  • The Chick
  • Fartillery: Gets this when she ate the Belch Boy packet in "The League of Villains" and proves to be better at it than Carl, given that she doesn't need seltzer or to be shaken to burp, and she can eventually control her burping to do it at will.
  • Gasshole: Becomes one after eating the Belch Boy packet in "The League of Villains", even to the point of making a dance out of her burps.
  • Give Geeks a Chance
  • Important Haircut: Libby gets one in the Beach Party Mummy episode to fool a bunch of mummies that were chasing the gang. She keeps the new look for the remainder of the series.
  • Only Sane Woman: Grows into this more and more as the series went on. By the end she's the most levelheaded character in the gang, much to her occasional frustration.
  • Promoted To Opening Credits
  • Puppy Love: With Sheen.
  • Sassy Black Woman
  • Satellite Character: Was originally one for Cindy, and several of her earliest appearances had her personality as more or less an echo of Cindy's, but as the characters got more development, she became more distinct.
  • Shipper on Deck: She's FOREVER pleading with Cindy to just tell Jimmy how she feels and get it over with!
  • Token Minority
  • Tomboy: She adjusts really quickly to becoming "Burp Girl" in "The League of Villains", even proving better at using the sonic-blast burps than Carl did in "The N-Men".
  • Women Are Wiser
  • Youthful Freckles: Libby gained some in season 2 after her redesign.


Voiced by: Frank Welker

Jimmy's robotic dog.

Hubert "Hugh" Beaumont Neutron

Voiced by: Mark DeCarlo

Jimmy's father.

Judith "Judy" Neutron

Voiced by: Megan Cavanagh

Jimmy's mother.

Nick Dean

Voiced by: Candi Milo

The "cool guy" that everybody loves at school, especially the girls.

Bolbi Stroganovsky

Voiced by: Phil LaMarr

The Twonkies


Owner of the local hangout joint, The Candy Bar.
  • Bullying a Dragon: Does so in the superhero episode the N-Men. Jimmy is a rampaging orange monster but upon seeing his parents, he starts calming down. Until Sam decides to throw fruit in Hulk/Jimmy's face. Needless to say, the mutated Jimmy doesn't take too kindly to it.
  • Jerkass: N-Men episode again. Granted something should have been done to try to help the kids control their new found powers. However, calling the military up to imprison them and then telling the kid's parents they were just freaks?
  • Verbal Tic: Has a habit of ending his sentences with, "Yeah!".

King Goobot

Voiced by: Patrick Stewart (movie), S. Scott Bullock (TV series)

King of the Yolkians, and Jimmy Neutron's archenemy.

Professor Calamitous

Voiced by: Tim Curry

Jimmy's arch-nemesis and the show's most recurring antagonist.

Beautiful Gorgeous

Voiced by: Wendie Malick

Professor Calamitous's daughter. Jimmy, Carl, and Sheen are easily seduced by her looks.


Voiced by: Tim Allen

The host of the hit game show "Intergalactic Showdown" and the main villain of the TV movie "Win Lose and Kaboom".
  • Big Bad: Of "Win Lose And Kaboom".
  • Doing in the Wizard : His seemingly supernatural hold over reality, time and space is actually caused by a pair of matrix generators hidden in his cuff links.
  • Faux Affably Evil: Rarely drops his cheery, hammy attitude even while threatening to blow up people's planets. At the end, he finally stops and decides to get serious.
  • Hypocrite: Insists during the race that there's no cheating allowed, but permits the Brains to put Jimmy and the gang into a Lotus-Eater Machine. Later he panics at the idea of his quadrant being blown up despite the fact that his entire show is about blowing up comepletely innocent planets simply because their species lost a game.
  • Karma Houdini: The worst he gets is being forced to hand over his show to the Brain aliens and advertise an exercise machine that implements Electric Torture. Probably justified as he's implied to be indestructible.
  • Large Ham: He's a Game Show host. It comes with the territory.
  • Omnicidal Maniac: "Winner gets a brand new car! Loser gets their home planet destroyed!"
  • The Omnipotent/Reality Warper: Thanks to the matrix generators in his cuff links.
  • Smug Snake
  • Time Abyss: Implied, as April states that his show has existed for eons.
  • Villainous Breakdown: Loses it when he discovers that his show is about to be destroyed.

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alternative title(s): The Adventures Of Jimmy Neutron
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