Characters / Dexter's Laboratory

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     Major Characters 

Voiced by: Christine Cavanaugh (seasons 1 and 2), Candi Milo (seasons 3 and 4), Jeff Bennett (his Future Badass self in Ego Trip)

  • Ambiguous Disorder: Much like his sister. He has No Social Skills, a genius, and has trouble with basic concepts.
  • AcCENT Upon the Wrong SylLABle: "Dee-DEE, get out of my laBORatory!"
  • The Ace: When it comes to science, of course. There was even an episode where one of his teachers clearly has the hots for him.
  • Adorably Precocious Child: Taken Up to Eleven in fan-works.
  • Adorkable
  • Animals Hate Him: As seen in an episode when Dee-Dee tries to get him to play outside numerous times and animals constantly beat him up. At the end of the episode, when Dexter is finally able to relax outside, several animals, including a fish, jump out of nowhere onto Dexter in a Big Ball of Violence.
  • Badass Beard and Bald of Awesome: His future self.
  • Badass Bookworm
  • Berserk Button: Mess with his sister, and you're dead meat.
  • Big Good: In "Ego Trip".
    • Also in any crossovers with other Cartoon Network franchises, he's either this or the de facto Leader including Cartoon Cartoon Fridays and FusionFall.
  • Butt Monkey: Nothing goes right for this kid. Nothing.
  • Child Prodigy/Innocent Prodigy: In one episode, he treats a burnt out light bulb as a kid would the death of a beloved pet.
  • The Chew Toy
  • Clock King: Dexter once bought an expensive popsicle and paid with pennies. When the ice cream man asked Dexter how long it took him to count the pennies, Dexter correctly answered the question.
  • Crouching Moron, Hidden Badass: Of a sort. Dexter tends to fail spectacularly at any form of physical activity, particularly sports... until the backdrop changes from "sports" to "Deedee let a giant monster out of the wormhole machine." Basically, he's an exaggerated stereotype of nerds are wimps up until science is involved. He can also go from deflecting lasers with his wrench like a Jedi to slap-fighting his rival and somehow manages to be in character both times. Rule of Funny is involved, but still.
  • Deadpan Snarker: Especially in his interactions with Dee Dee.
  • Depending on the Writer: How smart he is can differ from episode to episode.
  • Did Not Think This Through: Tends not to consider the full ramifications of his inventions and schemes. For example, in "Morning Stretch", he used a time-slowing helmet to turn thirty seconds into thirty minutes, allowing him the time to get ready for school. He failed to realise that the slowed time would prevent him from properly taking a shower or making breakfast, and his homework ignited from friction burn when he tried to finish it.
  • Ditzy Genius: He's able to time-travel, create robots and build portals to other dimensions, but is utterly incapable of taking care of himself for a single day when his mom is sick. He doesn't know how to cook (having never heard of "flour"), and as for cleaning... Also why would he put buttons and triggers in places Dee-Dee would obviously activates.
  • Extreme Doormat: His early 20's self in Ego Trip is this to Mandark.
  • Eye Glasses: The glasses can change shape depending on expression.
  • Fiery Redhead: His family is split evenly between this and the Dumb Blonde stereotype; he and his mother are fiery redheads and his sister and dad are happy-go-lucky yellow-haired ditzes.
  • The Finicky One
  • Foolish Sibling, Responsible Sibling: The responsible to Dee Dee's foolish.
  • For Science!: Catch Phrase
  • Future Badass: Invoked in the Made-for-TV Movie, Ego Trip, wherein Dexter travels to the future for the primary purpose of seeing what kind of Bad Ass he is. In the dystopian future version of himself, he comes to resemble his hero Action Hank: big, brawny, and bearded (and unlike Hank, he goes bald), and his Mad Scientist pseudo-Germanic accent is replaced by an Arnold impression.
    • Future Loser: This trope is also averted in Dexter's other two future versions, a wimpy office drone and a hilarious old man. The Future Badass version of Dexter exists between the two chronologically. However, we eventually see the former take a level in badass.
  • Gadgeteer Genius
  • Good Is Not Nice: He's an egotistical jerk, but undeniably a good person.
  • Grade Skipper: Dexter once went to college. At first, all other students only wanted to party and he refused to join, despite their warnings about getting it out of the system. By the time Dexter proved them right by buckling under the strain, they were the ones who only wanted to study for the upcoming finals. His attempt to make a wild college party happen anyway got him expelled.
    • In another episode, Dexter was considered for grade-skipping but needed to improve his P.E. grades. He cheated his way into victory and ended up becoming Dee Dee's yearmate.
  • Height Angst: In "Ewww, That's Growth", Dexter and his family want to go on a really big rollercoaster, but Dexter is denied due to being too short. The resulting angst drives him to become as tall as possible, eventually allowing him to finally go on the rollercoaster by the end of the episode. This backfires when he becomes so tall that he hits the ceiling at the very end.
  • Herr Doktor
  • Identical Grandson
  • Improbable Weapon User: He's pretty handy with a wrench in matters of melee combat as well as mechanics.
  • Insufferable Genius: He can be very arrogant..
  • Jerk with a Heart of Gold: But he's not a bad person.
  • Large Ham
  • Like Mother, Like Son: He's a Fiery Redhead like his mother. She is also the source of his pride and creative impulses.
  • Mad Scientist: Not villainous example, obviously.
  • Man Child: Teenager Dexter and Old Dexter could be excused, but Future Badass Dexter cements it by whining he should've been the one to save the future and goes on with the plan of creating robots to destroy Dee Dee.
  • Narcissist: He has a very high opinion of himself. Case in point: in "The Parrot Trap," he built a robotic parrot purely so he could hear it repeat his own self-indulgent praises.
  • The Napoleon
  • Nerd Action Hero: He has his moments in the show, being a super scientist with an assortment of cool robots and gadgets, but it really becomes true for his Future Badass version seen in Ego Trip.
  • Nerd Glasses
  • Nerds Love Tough Schoolwork: Looks forward to hard tests.
  • No Respect Guy
  • Omnidisciplinary Scientist: It may be easier to look for what areas of science Dexter HASN'T covered throughout the show.
  • Ping-Pong Naïveté: He had his moments of stupidity. One example is when he thought he was going to die...because he had gas. We're talking about a boy genius that has done everything from go inside his sister's body to traveling to other planets using his inventions.
    • To "simulate" the gas buildup in his lab, he used a balloon to represent himself. In other episodes/shorts, he didn't know what the "strange protrusions" all over his body were (he had the chicken pox) and tried to do a search through the entire animal kingdom for the "species" known as... the girl.
  • Precocious Crush: On Lisa, the babysitter.
  • Red-Headed Hero
  • Savvy Guy, Energetic Girl: Savvy Guy to Dee Dee's Energetic Girl.
  • Science Hero
  • Sensitive Guy and Manly Man: Sensitive Guy to his Father's Manly Man.
  • Shorter Means Smarter
  • The Short Guy with Glasses: He's two feet tall.
  • Small Name, Big Ego: Became one in later seasons due to Flanderization.
  • Smart People Know Latin: Or take it, anyway. In "Accent You Hate" he's shown opening his locker and saying "Good morning" to his Latin and math textbooks.
  • Teacher's Pet: Although Mandark gives him some competition.
  • Took a Level in Badass: In "Ego Trip".
  • TV Genius: He's a world renowned genius capable of building time machines, giant robots and create all sort of genetically modified creatures, yet thinks "girl" is some kind of tribe, doesn't know what dirt is, and one time thought he was going to die due to having gas.
  • Unexplained Accent
    • Possibly a meta-Author Avatar related reason: Tartakovsky was born in the Soviet Union and moved to the United States as a child. He (most likely) has one as a child.
  • What the Hell Is That Accent?: Dexter has a very peculiar accent that is either aiming for a stereotypical Eastern European accent, or a Bulgarian accent. Even Genndy Tartakovsky isn't certain what his accent is supposed to be.

Dee Dee
Voiced by: Alison Moore (Season 1 & 3), Kathryn Cressida (Season 2 & 4)

  • Accidental Hero: At the end of Ego Trip, much to the ire of the Dexters.
  • Ambiguous Disorder: Sometimes has hints of this- she lacks a lot of social intuition, can't take a hint, seems to be very temperamental, and even her own friends get frustrated by her odd behavior at times.
  • Action Girl: When the situation calls for it.
  • Adorkable
  • All Girls Like Ponies
  • Annoying Laugh: It sounds like a horse's neighing, only high-pitched.
  • Annoying Older Sibling
  • Art Evolution: Had thick eyebrows and seemed to lack a chin in early episodes.
  • Berserk Button: Mess with her brother, and you're dead meat.
  • Beware the Nice Ones / Beware the Silly Ones
  • Big Sister Bully: Her treatment of Dexter has shades of this at times. In one episode, she stole Dexter's money right out of his hands to buy something, and when Dexter asks why she did so, she tells him point-blank, "You're so small and weak that I could!"
  • Cloud Cuckoo Lander
  • Crouching Moron, Hidden Badass
  • The Cutie
  • Deadpan Snarker
  • Depending on the Writer: Gets hit with this pretty bad. How nice or annoying she is varies wildly from episode to episode. In some episodes, she's rather innocent and her destructive tendencies are accidental and due to playful clumsiness. In others, she's far more malicious and intentionally antagonistic.
    • She also flip-flops from stupid to a Straight Man for Dexter.
  • The Ditz
    • Genius Ditz: She has her moments. She gave a somewhat accurate description of Gregor Mendel in the Sasquatch episode.
    • A subtle moment from the show's opening titles. Dexter frantically presses a button, attempting to turn on a large light. Dee Dee briefly gives Dexter an aside glance and coy smile and plugs a cord into a nearby socket, causing the light to turn on.
  • Dreadful Musician: She has an absolutely terrible singing voice. Doesn't stop her, though.
  • Dumb Blonde
  • Dumb Is Good: Much more cheerful and pleasant than Dexter.
  • Foolish Sibling, Responsible Sibling: The foolish to Dexter's responsible.
  • Genki Girl: She's an extremely energetic, hyperactive girl.
  • Girlish Pigtails. Blonde gitails.
  • Girls Love Stuffed Animals: She loves her dolls.
  • Hypocritical Humor: Whenever Dee Dee meets someone of her own clingy and destructive level, she finds them intolerable and inconsiderate. For example, in the pilot episode, when she finds out that Dexter broke into her room to steal one of her dolls for experiments, she completely loses it and confronts him, while ignoring the fact that she regularly breaks into his lab uninvited and destroys it without a care for Dexter's feelings.
  • Idiot Houdini: Dee Dee always made a huge mess of Dexter's lab through her sheer idiocy, sometimes even causing quite a lot of destruction among others as well, yet she almost never got any repercussion for it. Seasons 3 and 4 were a little better about averting this. Partly because there were fewer episodes that had Dee Dee in the lab but she was a lot more prone to actually getting called out for her antics. It helps that there were times that she actually did try to clean up the messes she made and that she either went down with Dexter or suffered as a result of her own actions.
  • Innocent Blue Eyes
  • Innocently Insensitive
  • Kiddie Kid: Dee Dee is elder to her titular brother, and "Picture Day" episode implies that she is in the sixth grade. This would put Dee Dee's actual age somewhere between ten and twelve, but she tends to behave as if she were younger than Dexter.
  • Knight Templar Big Sister: Dee Dee may appear to be a flake, but you do NOT harm her little brother. Or she will kick your ass.
  • Leitmotif: This whimsical, piano piece that plays when she shows up, usually when dancing.note 
  • Like Father, Like Daughter: Her dad is where she gets her lack of foresight and curiosity.
  • Motor Mouth
  • Nice Girl: She's pretty darn sweet and she absolutely adores her little brother. Her destructive tendencies are usually due to clumsiness or carelessness rather than malice, and sometimes it's shown that the reason she's always sneaking into Dexter's laboratory is because she just wants to spend time with her brother.
  • No Indoor Voice
  • No Sense of Personal Space
  • Only Known by Their Nickname: Even her parents call her Dee-Dee.
  • No Indoor Voice
  • Person of Mass Destruction: Every time Dee Dee manages to get into Dexter's lab, she almost always leaves a massive amount of destroyed machinery and inventions in her wake. In Mandark's debut episode, Dexter even used this to his advantage to get back at Mandark.
  • Pink Means Feminine: Along with her two friends, who wear the same clothes as her.
  • Repetitive Name
  • Savvy Guy, Energetic Girl: Energetic Girl to Dexter's Savvy Guy.
  • Spanner in the Works: Especially in Ego Trip, when she wanders through the time portal at the end of the movie, goes "Oooh, what does this button do?", then pushes it and leaves.
  • Sweet Tooth
  • Walking Disaster Area: At least whenever she's in Dexter or Mandark's lab. Or being abducted by aliens. Otherwise she manages to keep the property damage to a minimum.
  • What Does This Button Do?: The Trope Namer.

Susan "Mandark" Astronomonov
Voiced by: Eddie Deezen

     Minor Characters 

Voiced by: Jeff Bennett

Voiced by: Kath Soucie

  • Action Mom: Demonstrated in "Mom and Jerry", "World's Greatest Mom" and "A Mom Cartoon".
  • Amazingly Embarrassing Parent
  • Berserk Button: As seen in "Dexter's Rude Removal", the most Mom ever got beyond angry was when the rude clones of Dexter and Deedee not only made a huge mess of her kitchen during a food fight but used profanity as well.
  • Beware the Nice Ones: Whenever her Berserk Button is pushed, or her children are threatened.
  • Cute Bruiser: See Action Mom.
  • Ditzy Genius: Like Dexter's dad, she shows frightening proficiency with technology when it comes to battling germs.
  • Fiery Redhead
  • Flanderization: Her Neat Freak tendencies get played up considerably in the later episodes.
  • Happily Married
  • Hartman Hips: The page image. In fact, when Dee Dee gets turned into a duplicate of Mom in one episode, she feels her hips with awe.
  • Housewife: She seemed to have little characterization outside of her housework, though it's implied at least a few times she was much more of a rebel in her youth. Her typical outfit that she wore everywhere even included yellow rubber dishwashing gloves and an apron.
  • Iconic Item: Her yellow rubber gloves. So much so that she feels naked without them.
  • Male Gaze: Cameras don't hesitate to get as many shots from the back as they can. "Better Off Wet" in particular features her in a bikini.
  • Mama Bear
  • Mistaken for Badass: She once "defeated" the reigning snowball champion (Dexter's dad) by playfully chucking a snowball at him. He's been convinced ever since that she has evil snowball powers, which she passed on to Dee-Dee.
  • Neat Freak: The episode "Pslyghtly Psycho" suggests that she is actually germophobic, particularly when her gloves and slippers are removed and she finds herself afraid to even set foot on the carpet barefoot.
  • No Name Given: Her first name is unknown.
  • Redhead In Green: She wears a pale green blouse-shirt with a wide collar, white apron and dark green pants. Also her bikini is green.
  • Skewed Priorities: She favors cleanliness over anything. One episode has her ignoring the fact Dexter had destroyed her entire house over the fact he was clean.
  • Unnamed Parent: She is only called Mom.

Lisa the Babysitter
Voiced by: Kath Soucie

Douglas E. Mordecai III

Voiced by: Tom Kenny

Voiced by: Frank Welker

  • Action Pet: When off duty, his personality is similar to Dee Dee's and he is often seen playing with her in the laboratory, but when it is time to save the world Monkey is extremely serious and heroic and risks his very life to ensure the safety of the world and those he loves.
  • A Monkey Named Monkey
  • Badass Adorable
  • Boxing Lessons for Superman: When Huntor's technology completely counteracts Monkey's powers, Monkey defeats the villain using only his skills, brains, and - uh - guerilla tactics.
  • Determinator: In his fight with Rasslor, he kept on being knocked down, and wouldn't give up. Rasslor threw the fight (and decided not to destroy the Earth) because of this.
  • Everything's Better with Monkeys
  • Flying Brick: He can generate an energy field around his body that gives him this set of powers.
  • Heroic Spirit: He can be defeated (with humorous ease in some cases), but he'll never surrender.
  • Interspecies Romance: He is often paired with his sidekick and girlfriend Agent Honeydew on his missions who he cares about deeply and appears to posses a psychic link with her.
  • Loves My Alter Ego: Non-romantic example. Dexter admires the super hero Monkey and has no idea that his lab monkey leads a double life. He remains thoroughly unimpressed that his monkey failed to developed super powers.
  • Monkey Can Breathe In Space: Apparently his energy field provides life support for himself and passengers.
  • Out of Focus/Demoted to Extra: In the Un-Cancelled seasons. He did get a bizarre Day in the Limelight episode, though.
  • Ridiculously Cute Critter
  • Secret Identity: As Dexter's lab monkey.
  • Superhero
  • Talking the Monster to Death: Convinces Simion, another super-simian, to abandon his plan of destroying the Earth in favor of swinging around in a jungle. Not bad for somebody who can only make monkey noises.

Agent Honeydew

Voiced by: Kath Soucie

  • Action Girl: As part of her agent training, she is a trained fighter who is proficient in firearms.
  • Boyish Short Hair: She has short black hair with curly bangs.
  • Hartman Hips
  • Interspecies Romance: Despite their different species' (and the questionable ethics of this), it appears that Monkey and Honeydew's relationship is very close and romantic, as both are often seen going out on dates when off duty, sharing romantic dinners and Monkey staying over at her house where they apparently bathe together while she grooms him.
  • Ms. Fanservice: She is a sexy spy.
  • Raven Hair, Ivory Skin
  • Spy Catsuit: She wears a violet-blue S.H.I.E.L.D.-style jumpsuit when is in mission.

Quackor the Fowl/Ducky

  • A Dog Named "Dog"
  • Evil Counterpart: To Monkey.
  • Feathered Fiend: An evil duck.
  • Heel–Face Turn: In her second appearance, due to falling in love with Monkey.
  • Samus Is a Girl: Implied in her second appearance; she and Monkey not only fall in love, but she lays an egg. So she's either a girl or a Mr Seahorse.
  • Punny Name: Quackor the Fowl; "fowl" is a term for both ducks and chickens, while a homonym "foul" means "wicked" or "amoral".
  • Undying Loyalty: Implied to have this for Mandark in her debut episode, seeing as she goes off to destroy Dexter's lab after hearing Mandark mumble about wanting to do so in his sleep.

Simion the Monkey
Simion the Monkey!
Voiced by: Maurice LaMarche

Major Glory

Voiced by: Rob Paulsen


Voiced by: Tom Kenny

The Infraggable Krunk

Voiced by: Frank Welker

Action Hank

Professor Williams

Voiced by: Paul Williams