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List of Jimmy Neutron characters

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This is a list of all The Adventures of Jimmy Neutron: Boy Genius characters.

Main characters

  • James "Jimmy" Isaac Neutron is the main character of the show. He is a ten-year old genius inventor whose inventions often go awry and generally cause massive damage to the town, annoy the inhabitants Retroville, or cause a situation which brings a near-extintion of mankind. These situations call for Jimmy to find a way to fix the problem he caused, and usually it's up to him to save the day against his own creations. He often uses sudden surges of thought which he calls Brain Blasts. His name is a spoof of the scientist Isaac Newton. His amazing inventions include self-folding pants that put themselves away, hi-tech binoculars (called Neutrascopes), his robotic dog Goddard, a Cheese Ray that can transform things into cheese, a time booth for traveling to the past (constructed from a phone booth), tiny talking robots called Nanobots invented from the same chip used to make the self-folding pants, a translator that can be used to communicate with fish, Neutronic air gum that allows one to breathe underwater, gum that allows one to memorize an entire book by chewing it, the JimmyBot, candy that uses every possible pleasure taste bud, a brain drain machine that can adjust a IQ level from Albert Einstein to drool-monkey, a jetpack, a motorized tire, a mini-submarine, a flying rocket as well as a flying land/sea hover-car, and a giant machine known as the Neutronic Game Pyramid that can insert people into their favorite video games, BroBot and BroBot's Parents. He has an extensive laboratory below his clubhouse which is accessed via hair DNA scan. Carl Wheezer and Sheen Estevez are his best friends. Although he isn't an Ultra Lord fan, like Sheen, Jimmy has his own action-hero that he looks up to, the super-spy guy named Jet Fusion, who stars in many movies shown in the Retroville Theater and actually is a real spy whose movie titles are arguably spoofs of 007 fame. Jimmy has a crush on Betty Quinlan and Cindy Vortex, the latter of which he denies, although at the end of episode 55, Lady Sings the News, Jimmy kisses Cindy on the lips and walks away. He is voiced by Debi Derryberry.
  • Goddard is Jimmy's robotic dog, equal parts, useful tool and best friend. Goddard is one of Jimmy's very few successful inventions. He can do many things, including blow up and re-assemble himself after being told to "play dead". When Jimmy is in trouble, Goddard gives his suggestions on a screen on his chest. The two first are always the most outrageous, but the third and last is always the one that Jimmy will follow. Goddard is voiced by Frank Welker and various others, and named after rocket pioneer Robert Goddard (scientist). Hugh says Goddard can do 11,000,004 things, except clean up after himself, which is really a hobby for him.
  • Carl Wheezer is Jimmy's neurotic, llama-loving friend. According to canon, Carl was born in 1992. He is ten years old. Carl is known as nervous, timid and suffering from hypochondria; at times, he tries to overcome these personality traits in order to appear "cooler" around Jimmy and mutual friend Sheen Estevez. He has many talents, the most recognizable is his "phenomenal" singing, with the "hit-single", Folding and Hanging, among other pieces such as "Singing and Sitting". Carl also appears to be in love with Jimmy's mom, Judy Neutron, accidentally saying that she's beautiful around Jimmy and Sheen, and carrying around a picture of Jimmy's parents with his head pasted over Jimmy's dads. When his parents expanded their cable lineup, Carl found himself focusing on a channel devoted to llamas and a show about a singing and flying super-hero crossing-guard called Llama Boy; he has adored them ever since, going so far as to join a fan club, the Llama Love Society. He is allergic to just about everything, perhaps including llamas much to his disappointment. His blood type is O Negative. Carl Wheezer has a sensitive scapula. Carl and his parents are voiced by Rob Paulsen. His birthday is January 17th. In the episode "Normal Boy", it's revealed that Carl is the inventor of the "Hot Dog Holder Delux", also known as the versa-bun(which is a normal Hot Dog bun that he didnt really invent). It is revealed in The Incredible Shrinking Town that he took ventriloquist lessons, he can virtually imitate and sound just like everyone. In the episode "Carl Wheezer, Boy Genius" Jimmy and Sheen try to make Carl seem smart to his visiting pen pal girlfriend, and he gets extremely carried away with the plan, and ends up forgetting his "old self", and actually thinking that he's the super genius and that Jimmy Neutron is his "dim witted annoying assistant". Later in the episode however, it turns out his Swedish pen pal works with llamas and doesn't even like geniuses much. Carl has a fake knee.
  • Cindy Vortex is Jimmy's semi-sassy mouthed, emancipated rival who is skilled in both the fine arts of Tai Chi and Tae Kwon Do. Although she is not exactly an inventor (except for her "Sweat Socks Transmogrifier"), she can build 'chocolate volcanoes that engulf the helpless gumdrop citizens of Pompeii', with ease. Cindy, in stereotypical "girl" fashion, schemes to be popular, as seen in Out Darn Spotlight, and used to be the town's resident genius prior to Jimmy's arrival (perhaps she calls him "Nerd-tron" out of jealousy?). She is almost a match for Jimmy's intellect, and although he surpasses her in his knowledge of science, she often keeps up with him in other areas, such as singing, art, acting, and poetry. Whereas Jimmy has a robotic dog, Cindy has a real one. She's obviously in love with Jimmy, but treats him like dirt to hide her true feelings (similar to Helga G. Pataki of Hey Arnold!). Jimmy returns these feelings, but he tries to cover them up just the same. Cindy usually calls Jimmy "Nerdtron" or some other such name. She also ruins Jimmy's good moments on occasion (the end of The Incredible Shrinking Town). Cindy almost proclaims her love for Jimmy twice, first in "The N Men", (upon which she faints due to losing energy from the mutation) and in The League of Villains where Jimmy kisses her on the cheek and she shows signs of being love-struck. A time that truly reveals their love is at the end of episode 55, Lady Sings the News, when Jimmy kisses Cindy on the lips and walks away. Another time Jimmy kissed Cindy-but that was when Jimmy was stuck in Carl's mind of dream/fantasy land and it was the only way Jimmy could convince Carl to wake up-later Cindy comes over furious to Jimmy's house to give him a right cross and proclaims "Not even in his dreams Neutron". In "Trading Faces" when Jimmy's latest mindreading invention backfire's and Jimmy and Cindy trades minds in each other's bodies-later when the procress is reveresed Cindy remarks about how their minds had mixed and one of them was imagining the two of them walking in the park, holding hands, and kissing. Jimmy admits to remembering that, but denies being the originator of that thought. Cindy also denies, and the two argued. In "Stranded", it is revealed that nobody knew that Cindy knew Jimmy's real name. In "The King of Mars" Cindy goes out to get Jimmy's attention, by putting on Perfume. During the Episode Cindy wears her new flying suit and gets Jimmy's attention involving a few scenes where Cindy is Glowing through the eyes of Jimmy. Later in that Episode Jimmy admits that he only pretends to ignore Cindy and says "I just think you're pretty smart and...you smell nice...and you kinda distract me...sometimes"(referring to Cindy). In My Big Fat Spy Wedding when Jimmy walks up to the church in a tux, Cindy refers to him as a "Hunk... muffin!", calls him "James", and then later records herself saying he was handsome on camera but later rewinds and records over it. In the hour long crossover special, The Jimmy Timmy Power Hour, Cindy develops feelings for Timmy Turner which continues in the sequel and upsets Jimmy. Her romantic responses to Timmy stem from the fact that he represents everything to her that she wants to obtain from Jimmy- i.e. attention, consideration, and courtesy. In the second power hour, she becomes angry at Jimmy for blowing her off, so she forces herself to like Timmy even more. Even though she loves Jimmy and only likes Timmy, she revels in the attention of two guys and hence doesn't want to make a decision. According to director Keith Alcorn, the two power hours should be viewed "out of continuity with the rest of the series." If it were to have a fourth season (which it won't), Cindy would easily end up with Jimmy. If Jimmy admitted that he loved her(which he won't), Timmy would no longer serve a purpose to her. Recently she seems to be becoming a very slightly more gentle mellowed out character and has picked on Jimmy a bit less as of late. Her birthday is June 5th. Cindy is voiced by Carolyn Lawrence.
  • Hubert "Hugh" Beaumont Neutron is Jimmy's father. Completely oblivious to the fact that his son is a prodigy and childish at times, he is otherwise a stereotypical father and always has a piece of advice for him. Hugh has many genius relatives (along with some not so bright relatives), so Jimmy's genius is most likely inherited paternally (this has not been confirmed, however). Like many of the Neutron characters Hugh has his humorous obsessions, such as pie, butter pats, puppets, and ducks. He invented a holiday based upon pie, known as Pule (Combination of pie and Yule). At a young age, he was an Acorn Lad scout. Hugh always tries to relate his childhood experiences to Jimmy's, but they are often much stranger such as being banned from the school science fair because he burped the table of elements. One of Hugh Neutron's favorite things to do is collect antique duck decoys, and display them around the house, he occasionally decides one of them is his favorite, but loves them all equally. Hugh has a puppet named Flippy, and is a former toy inventor. He's currently a car salesman and truly enjoys cleaning up Goddard's Lug-Nuts. Hugh also has an interesting taste in family vacations, such as visiting the world's largest underground parking structure, as can be seen a photo of, in the Neutron Family Album. Hugh was given the esteemed name of Towel Boy in Junior High. Hugh Neutron is a fan favorite almost at the level of Jimmy himself. He is voiced by Mark DeCarlo.
  • Judy Neutron is Jimmy's mother. Smart and full of common sense, she is amused with the many antics of her husband. Like a stereotypical mother, she is often preoccupied with tidying up and usually is concerned when Jimmy is off adventuring, of which Hugh is usually oblivious and unaware of, often lamenting the fact her son is such a genius. She sometimes dusts the front lawn, which is quite terrifying. She is also an unofficial grease monkey and is very knowledgeable with machines. In the early episodes, it was hinted that Judy was a genius like her son and thus where he gets his intelligence from. Judy is voiced by Megan Cavanagh.
  • Sheen Juarerra Estevez is Jimmy's hyperactive heroic friend, he is 12 years old making him 2 years older than Jimmy and Carl. The three are in the same school grade because Sheen was held back twice. Sheen's wardrobe largely consists of a blue t-shirt and jeans. The t-shirt depicts UltraLord, a popular superhero within the show that Sheen is obsessed with. Sheen is of Mexican ethnicity, he has the type of accent that sometimes sticks with Spanish-speaking individuals after completely adopting English. He speaks Spanglish once in a great while (In the Mexican Spanish dub of the series, he speaks Spanish with a Japanese accent). Like many other animated characters, Sheen rarely changes his clothes and always wears an Ultra Lord T-shirt to show his devotion and loyalty to his favorite super hero whom he looks up to as a role-model. Not surprisingly, Sheen wrote the entire Ultra Lord website on the Internet. Sheen knows some kung-fu, but he can't win a fight without the proper training of a special CD-ROM, that dictates his body movements to make use of the proper techniques and moves. Sheen has the largest Ultra Lord action figure collection in all of Retroville, and is extremely offended if someone refers to them as "dolls". Sheen was once sent into his favorite Ultra Lord video game, and he got to do battle with Ultra Lord's arch enemy, Robo-Fiend with help from Jimmy Neutron. Carl Wheezer controlled Robo Fiend in the Lab for a bit, not realizing that Jimmy and Sheen were really in the game, then decided to play a llama video game, saving Jimmy and Sheen with a huge thunder storm of llamas. Thankfully, the evil Robo Fiend was allergic to llama milk. Sheen appears to like guacamole bars, as shown when he was running for class president. Sheen is a member of an "Action Figure Support Group". Although Sheen seems fearless, he is scared of one thing, the crawl-space under Granny's house. Sheen is usually seen on the show tagging along with Carl, respectively, as they are best buds, in most of the episodes, much like the friendship between Cindy and Libby. Sheen is quite educated in the realm of restaurant terminology and slang, as seen in the episode "Men At Work". Sheen has abilities with monkeys and can summon the Atomic Monkey Special Forces Squad whenever he wants to. He also has a huge and developing crush on Libby, which seemed to begin after her hair makeover. The character of Sheen is best known for his hilarious hyperactive manic behavior, and overbearing tone of voice. Sheen is always depicted as unusual and eccentric, often saying very interesting but strange phrases. In the episode "Beach Party Mummy" it is suggested that Sheen might be on some form of medication and/or medicine (possibly ADD, since he is hyperactive and have a really short attention span). Usually when sitting at a table with the whole gang, he always suggests that they play "Spin the Bottle", hoping to be kissed by Libby. The name "Sheen Estevez" appears to be a reference to the Estevez family of actors — specifically the three members, Ramón, Emilio, and Carlos, who use the screen name Sheen (Martin and Charlie Sheen, respectively). Sheen is another fan favorite, and like Hugh, has his own fanlisting. The character Sheen is known as Max in the German dubbed version of the series. Voiced by Jeff Garcia, who also won an Annie award for the role. His birthday was November 19th. Sheen sometimes fails to grasp the reality of things. For example, in "Win, Lose and Kaboom", Sheen is told that if he loses, Earth will be destroyed; he ignores that and is excited to get a car if he wins. Sheen is optimistic and only speaks negatively when he's trying to depress Carl. He usually does this by scaring him, yelling at him, or talking about llamas dying horribly. ("And Carl's llamas fall down, down into the sulfurous mud pits! How the snake god will be pleased!") Another fact about Sheen is that he is the only main character without a mother present; Sheen lives with his father and grandmother (although referenced often by Sheen himself, his grandmother has not been seen in the series). Creators of the show have revealed that this is because Sheen's mother died when he was very young. He does, however, have a little sister, as mentioned in "I Dream of Jimmy" when he talks about a fight he had with her about the 'Potty Fairy'. The name and age of the sister is unknown, and she's never been seen in the movie OR TV series.
  • Liberty "Libby" Danielle Folfax is Cindy's best friend. She is African American, and she loves music and experiences withdrawal when not constantly exposed. Pretty intellectual, and loves electronic gadgets. Related to Egyptian Queen Howsaboutislapya (pronounced "HAWS-uh-bot-uh-SLAWP-yuh), as seen in the episode "Beach Party Mummy", where she received a brand-new hair makeover to look like the Queen of the Nile, which she still has. She's 11 years old. Libby listens to only the funkiest music. She can play the piano as seen in My Big Fat Spy Wedding. She mostly returns Sheen's interest in her, but only when he's not annoying her with his overbearing mentions of Ultra Lord and his occasional flirting. Voiced by Crystal Scales. Her birthday was December 11th. Libby sometimes joins Cindy in teasing Jimmy, but she has full knowledge that Cindy and Jimmy love each other. She is the only one of the main characters who has a sibling; her little brother appeared in the Father's Day episode, "Make Room for Daddy-O". Along with Cindy she won a 1st place trophy for riverstomp dancing at the School contest; Jimmy, Carl, and Sheen almost beat the girls with Jimmy's electronic rock music guiters and drums but at the last minute the boys destroyed their own instruments in a jealous quarrel and the only thing they ended up with was a 8th place trophy(there were only seven acts)!!
  • Ms. Winifred Fowl is a 5th grade teacher at Lindbergh elementary school. Attracts the oddest men: was married to a werewolf at some point, danced with President Calvin Coolidge and once dated Thomas Edison after Jimmy brought the famed scientist to the future. She used to be in the rodeo before she became a teacher. Resembles a large bird both in her hooked nose and tendency to squawk, hence the name. In one instance (The episode: "Subsitute Creature"), Jimmy brought a million year old spinach plant that he mutated from a leaf stuck between a dinosaur's teeth. Jealous of all the attention Cindy received for her beautiful and fragrant flowering plant, his project is presented hastily and little seed pods burst from the plant, and fly into Ms. Fowls mouth. The result is a 50-foot plant-like woman...and lots of trouble for Jimmy. She is voiced by Andrea Martin. Her birthday is June 8th.
  • Nick Dean is the "cool" kid at school, most likely of Italian descent. Often seen on a skateboard, doing dangerous tricks. He doesn't do show and tell, and is obsessed with styling his hair. Breaks his leg from time to time on his skateboard, when he does so he usually lets out a high pitched girly scream. He was originally going to be part of the regular gang; (In the movie he had that role more than Libby) and Libby would be one of the supporting kids such as Butch or Oleander. He can also sing operatic German, and can style his hair without using his hands. Voiced by Candi Milo.

Minor characters

Minor characters in The Adventures of Jimmy Neutron: Boy Genius are listed below:

A

  • Amber, A friend of Cindy and Libby for a while, voiced by Debi Derryberry.
  • April, A Gorlock Alien who competed on Intergalatic Showdown. She convinced Jimmy to save all their planets. On her planet a kiss is a sign of gratitude, but in the end displays this as a kiss. One of Jimmy's crushes, made Cindy extremely jealous {she kissed him (both in the human and gorlock ways)} (appears in Win, Lose and Kaboom). Voiced by Alyssa Milano.

B

  • Baby Eddie, Jimmy's infant evil genius cousin, whom looks identical to to Granny Neutron as an infant. He was trained to be evil by Professor Calamitous, voiced by Paul Greenberg. (appears in Clash of the Cousins, The League of Villains, and made a brief cameo in My Big Fat Spy Wedding)
  • Beautiful Gorgeous, An evil villainness whom is the daughter of Jimmy's enemy, Professor Calamitous, voiced by Wendie Malick. (appears in Operation:Rescue Jet Fusion, My Big Fat Spy Wedding, The League of Villains)
  • Betty Quinlan, an attractive one of Jimmy's crushes whom also makes Cindy extremely jealous, but she doesn't show it (or at least tries not to.) She is probably a better choice for Jimmy as she's never been cruel to him like Cindy. Recently she told Cindy that she's fully aware of Cindy's crush, and Cindy that "He's all yours". (Appears in Party at Neutron's, Out Darn Spotlight, One of Us, The Vaniching act, and brief apperances on My Big Fat Spy Wedding and The Jimmy Timmy Power Hour 2: When Nerds Collide) Voiced by Kath Soucie.
  • Bolbi Stroganovsky, the weird resident exchange student from Backhairistan, has a surprisingly good Shakespearean acting voice (but only when auditioning), voiced by Phil LaMarr. He appears as a medieval peasant.
  • Bonzilla, a 10 inch tall reptillian beast in Japan. Bonzilla is a spoof of Godzilla. He makes two appearances, one in Retroville 9, and one in Win, Lose and Kaboom. In Retroville 9, he is visited by the Retroville 9 after losing to another team in Japan. Sheen insults Bonzilla, resulting in him being burned into a crisp by Bonzilla's fire breath. In Win, Lose and Kaboom Bonzilla is a member of the audience.
  • Britney, A friend of Cindy, Libby, and Amber, voiced by Candi Milo.
  • Brobot, Jimmy's annoying adopted robotic brother, voiced by Paul Greenberg. (appears in episode Brobot, The Junkman Cometh, The League of Villains)
  • Buford Lee Stormshuckle, the warden of a correctional facitiy who framed Jimmy for a bank heist. Is currently incarcerated, voiced by Bill Farmer (appears in Who Framed Jimmy Neutron?).
  • Burp Boy, Carl's superhero form, voiced by Rob Paulsen. (appears in The N Men)
  • Butch, the slightly slack jawed bully, voiced by Rob Paulsen.

C

  • Cap'n Betty, an odd pirate who knows about a monster, which is actually Carl's pet turtle, voiced by himself. (appears in episode Monster Hunt, My Big Fat Spy Wedding, and numerous cameos, many of them well-hidden)
  • Chip, A teenage hologram of Skeet, voiced by Rob Paulsen. (appears in episode A Beautiful Mine)
  • Chuck Lester, The short-lived hall monitor who moved away to Greece, voiced by Crystal Scales. (appears in episode Hall Monster)
  • Coach Gruber, The coach of Lindbergh Elementary, voiced by James Belushi.
  • Commander Baker, the Big Top Secret Organization commander, voiced by Michael Clarke Duncan. (appears in episode Operation: Rescue Jet Fusion, My Big Fat Spy Wedding)
  • "Cool" Hugh, the cooler variation of Jimmy's father seen in the Father's Day episode, voiced by Peter Frampton.
  • Corky Shimatzu, a famous Japanese big-shot TV programmer, whose catch-phrase is "Super Crazy!" with no relation to the professional wrestler. Voiced by Billy West.*
  • Cousin Gomer, Jimmy's other cousin besides Cousin Eddie,he sounds like Gomer Pyle from The Andy Griffith Show and Gomer Pyle, U.S.M.C.. Only seen in Clash of The Cousins.

D

  • Dr. Dark/The Pizza Monster, A story-telling hologram gone awry, and the hologram and pizza hybrid that appears when Jimmy's sleepover machine goes haywire, Both voiced by Corey Burton. (appears in episode Sleepless in Retroville)
  • Dean Kane, dean of Pomona SAP
  • Doctor Sydney Orville Moist, A scientist who became Jimmy's enemy.

E

  • Elves, Santa and Nicole Claus' elves. All are voiced by Jeffrey Garcia. (appears in episode Holly Jolly Jimmy)
  • Mr. Estevez, Sheen's elusive father, voiced by Mark DeCarlo
  • Eustace Strytch, a rich, snobby kid seen in "Billion Dollar Boy, "The League of Villains", '"King of Mars", The Jimmy Timmy Power Hour 3: The Jerkinators and the bitter rival of Jimmy, voiced by Rob Paulsen.

F

  • Mrs. Folfax, Libby's mother, voiced by Crystal Scales.
  • Future Copbot, a robot from an alternate future with four arms that loves Grey Star music. He has the ability to clone himself. (appears in episode The Tomorrow Boys)

G

  • General Ernest Abercrombie, a dull-witted military general who was a student in Ms. Fowl's class, voiced by Ernest Borgnine.
  • Giggles the Clown, the boring clown seen in the "Hypno Birthday To You" and the "Foul Bull" episodes, voiced by Ben Stein. (Incidentally the Brain drain IQ settings are Albert Einstein; Ben Stein, Normal and Drool-monkey).
  • Granny Neutron, Hugh's mother and Jimmy's grandmother. Jimmy once turned her into a baby in "Granny Baby", voiced by Phyllis Diller.
  • Grandma Taters, featured in "One of Us" and "The League of Villains " voiced by Edie McClurg.
  • Gretchen, Carl's future wife, voiced by Megan Cavanagh.
  • Grey Star, Libby's favorite band. They are college students in Jimmy Goes to College. They are a parody of Greenday. (Appear in Attack of the Twonkies, The Tomorrow Boys, Jimmy Goes to College)

H

  • Hilgo, the big, fearsome maid as seen in "Time Is Money", who also made a guest appearance in "Return of the Nanobots" as a lunch lady who once made shoes for lunch, voiced by Jill Talley.
  • Humphrey, Cindy Vortex's dog seen in "Crime Sheen Investigation".

I

  • Invisible Sister, Libby's superhero form, voiced by Crystal Scales. (appears in The N Men)

J

  • Japanese Announcer, an unseen character from Japan voiced by Michael Hagiwara. (appears in episode Retroville 9)
  • Jet Fusion, Jimmy, Carl, and Sheen's (2nd) favorite superhero. A parody of James Bond. He is voiced Christian Slater. (appears in episode operation: Rescue Jet Fusion, My Big Fat Spy Wedding)
  • Jimmy's dancing girls, two women used in Jimmy's campaign. One is voiced by Terry Wood and the other one is voiced by Amber Woof. (appears in episode Jimmy for President)
  • Jimmy Clones Happy, Gloomy, Funny, Cool, Romantic, and Evil, Clones of Jimmy. All voiced by Debi Derryberry. In "Send in the Clones", Jimmy made these clones to do his chores while he harvested moon rocks. Jimmy's clones caused trouble, and he had to stop them, but the Evil Jimmy got away. In "The Trouble with Clones", Evil Jimmy came back, and started hypnotizing people when Jimmy tried to turn him good and hired him to do the chores. Evil Jimmy then made an evil clone of the earth, causing the real earth to disappear. The original Jimmy went to that earth and had to reverse the effects.
  • Ms. Jingle Bells (Megan Cavanagh; appears in episode Operation: Rescue Jet Fusion, Part 1) A girl rescued by Jet. A parody of various Bond girls.
  • Junkman (Charlie Adler; appears in episode The Junkman Cometh, "The League of Villains" and makes a cameo in "Win, Lose and Kaboom"), a filthy creature from another planet.

K

L

  • Lance (Billy West; appears in episode The Retroville 9)
  • Lars Svenson (Billy West; appears in episode The Science Fair Affair)
  • Libby's little brother (Crystal Scales; appears in episode Make Room for Daddy-O)
  • Living Lima bean Appears in I dream of Jimmy and made a cameo in Win Lose and Kaboom
  • Lou (Billy West; appears in episode Holly Jolly Jimmy)
  • Lucky Joe, has an eyepatch (Billy West; appears in episode When Pants Attack)

M

  • Maggie (Crystal Scales; appears in episode Birth of a Salesman)
  • Masseuses (Megan Cavanagh; appear in episode MaternoTron Knows Best)
  • MaternoTron, Jimmy temporary replacement robot Mom. (Megan Cavanagh; appears in episode MaternoTron Knows Best)
  • Max, (Tom Kenny; appears in episode Maximum Hugh)
  • Mayor of Retroville (Jim Cummings; has a resemblance to Walt Disney and Clark Gable; appears in episode Monster Hunt)
  • Meldar Prime, evil host of gameshow Intergalatic Showdown. Appears in Win, Lose and Kaboom Voiced by Tim Allen.
  • Mayor Quadar (Mark DeCarlo; appears in episode "Normal Boy")
  • Mombot (Grey Delisle; Brobot's Mom, appears in episode Brobot and The Jukeman Cometh)
  • Monks of Shangri-Llama, (appear in episodes Operation: Rescue Jet Fusion, Part 2 and Crouching Jimmy, Hidden Sheen)
  • Mr. Moodini (Tom Kenny; appears in episode Maximum Hugh)
  • Mummies (appear in episode Beach Party Mummy)

N

  • Nanobots (Daran Norris and Tom Kenny; appear in episode Safety First, "Return of the Nanobots," "Fundemonium.")
  • Nathan Decarlo (Jeffrey Garcia; seldom appears)
  • Nissa (Debi Derryberry; seldom appears) A "one toothy girl" that taunted Jimmy once.

O

  • Octopus Man, a movie monster ("he has 8 arms!") (Mark DeCarlo; appears in episode Nightmare in Retroville as a monster in a movie that Hugh was watching.)
  • Officer Tubbs (Frank Welker; appears in episode Holly Jolly Jimmy)
  • Old Carl (Rob Paulsen; appears in episode Granny Baby, and Grumpy Young Men)
  • Old Lady Nussbaum (Megan Cavanagh; appears in episode Normal Boy)
  • Oleander, an odd geek bullied by Butch, and once owed Sheen 53 cents (Rob Paulsen; appears in episode Hall Monster and Return of the Nanobots)
  • Ooblar, Yokian sidekick of King Goobot (in the original film Martin Short, in the series Paul Greenberg; seldom appears)
  • Ozzie (Crystal Scales; appears in episode The Retroville 9)

P

  • Phantom, (appears in episode Phantom of Retroland)
  • Popbot (Jim Cummings; appears in episode Brobot and The Junkman Cometh), Brobot's father robot.
  • Poultra, original chicken goddess of Yokian race (seldom appears)
  • Principal William Willoughby, The fruity old Principal at Lindbergh Elementary School (Rob Paulsen; seldom appears)
  • Princess Guan Qi "Peggy" Tsu (Ming-Na; appears in episode The Great Egg Heist)
  • Professor Crank (Dan Castellaneta; appears in episode Operation: Rescue Jet Fusion)
  • Professor Finbarr Calamitous, (Tim Curry; appears in episodes Professor Calamitous, I Presume, The Great Egg Heist, Operation: Rescue Jet Fusion, The League of Villains, Lights, Camera, Danger!, My Big Fat Spy Wedding and The Jimmy Timmy Power Hour 2: When Nerds Collide) Ms. Fowl's former student, despite his age. Finbarr Calamitous was once a brilliant boy who could never finish anything, not even a sentence. He later overcomes this, and Finbarr Calamitous is heard completing sentences as seen in "Operation: Jet Fusion", "The Great Egg Heist", and "The Jimmy Timmy Power Hour II." Out of all of Jimmy's adversaries, he has made the most appearances in the series.

Q

  • Queen Howsaboutislapya, A fictional Egyptian queen a said to be ancestor of Libby
  • Queen Cleopatra, An Egyptian queen and an ancestor of Libby

R

  • Rayburn, the holographic butler (Corey Burton; appears in episode Aaughh!! Wilderness!!)
  • Robo-Fiend, enemy of Ultralord (Rob Paulsen; appears in episode Ultra Sheen, mentioned often by Sheen)

S

  • Sagebrush Sally (Grey Delisle ; appears in episode Foul Bull)
  • Sam, owns the Candy Bar (Billy West; seldom appears)
  • Santa Claus (Mel Brooks; appears in Holly Jolly Jimmy)
  • Sasha Vortex (Cindy's mother who doesn't look much like her daughter at all)
  • Susie Vortex, Cindy's Aunt, award-winning athelete (Megan Cavanagh; appears in episode Maximum Hugh).
  • Sheezicks (Mark DeCarlo; appears in episode Maximum Hugh)
  • Shirly a.k.a. the villain who's not named Shirley, villain created by Jimmy Neutron and Timmy Turner {?;appears in episode Jimmy Timmy Power Hour 3}
  • Skeets Calls everyone "dude" (Rob Paulsen; appears in episode Men At Work)
  • Snappy, Carl's mutated turtle (appears in episode Monster Hunt)
  • Special Girl, Cindy’s super hero form, strength, flying, and super vision
  • Swimmy, Carl's undead goldfish (appears in episode Beach Party Mummy)

T

  • Tee (Kevin Michael Richardson; one of the three alien claim-jumpers; appears in episode A Beautiful Mine, Men at Work, The Incredible Shrinking Town and The League of Villains, one of the jewel hunting bandits who turns good in The League of Villains. A knock-off of Mr. T.
  • Terry Finster (Candi Milo; appears in episode Safety First)
  • Thomas Edison (Rob Paulsen; appears in episode The Big Pinch)
  • Tina Sue (Carolyn Lawrence; appears in episode Operation: Rescue Jet Fusion, Part 1)
  • Travoltron (Jeff Bennett ; the second of three alien claim-jumpers, appears in episode A Beautiful Mine, Men at Work, The Incredible Shrinking Town and The League of Villains) His name was probably made by the fact that he sounds like John Travolta. In first appearance he was named Barbarino.
  • Tremendous Jackson, baseball star (Kevin Michael Richardson; appears in episode The Retroville 9)

U

V

  • Vibrating Lad, Sheen's superhero form (in episode The N Men)
  • VOX (Megan Cavanagh); Jimmy's computer, rarely heard in later seasons

W

  • Wendell (Frank Welker; appears in episode Make Room for Daddy-O)
  • Mr. and Mrs. Wheezer, share many of Carl's allergies and hypochondria (Rob Paulsen; seldom appear)
  • Willy Loman 3000, the ultimate sales robot (Tom Kenny; appears in episode Birth of a Salesman, named after Willy Loman of Death of a Salesman)
  • Mr. Wuggles, Carl's hamster (Frank Welker; appears in episode My Son, the Hamster)

Y

  • Yentil Marvelstein (Debi Derryberry; appears in episode Journey to the Center of Carl) A sick child that joins Jimmy's classroom.
  • Yoo-Yee (James Sie; appears in episode "Crouching Jimmy, Hidden Sheen")

Z

  • Zix, (Maurice LaMarche; leader of Tee and Travoltron, appears in episode A Beautiful Mine, Men at Work, The Incredible Shrinking Town and The League of Villains) He appears to be based on comedian Jon Lovitz.
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