Dexter, a boy-genius with a secret laboratory, constantly battles his sister Dee Dee, who always gains access despite his best efforts to keep her out, as well as his arch-rival and neighbor, Mandark.
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see all options Availability data: JustWatch
- Seasons
- 4
- Episodes aired
- 220
- Latest aired
- S04E36
- Total runtime
- 1d 3h
Timeline when each season aired
- Season 1 April 1996 – January 1997 38 episodes
- Season 2 July 1997 – June 1998 108 episodes
- the show was away for 3 years and 5 months
- Season 3 November 2001 – September 2002 36 episodes
- Season 4 November 2002 – November 2003 38 episodes
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S01E01 DeeDeemensional
April 28 · 7min find the promo
Show synopsis
In "Deedeemensional", Dee Dee time-travels to save Dexter from a monster. In "Magmanamus", Monkey goes up against a lava being that dislikes human-caused noise. In "Maternal Combat", when his mother falls, Dexter creates a robot mom to substitute for her.
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S01E02 Dial M for Monkey: Magmanamus
April 28 · 7min find the promo
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Monkey must defend the city from a giant underground lava monster, Magmanamus, who cannot sleep because of the noise created by its residents.
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S01E03 Maternal Combat
April 28 · 7min find the promo
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When his mother falls ill, Dexter creates a robot to do her chores. Dee Dee gets hold of its remote control and wreaks havoc, forcing Dexter to create a second robot to counter Dee Dee's.
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S01E04 Dexter Dodgeball
May 5 · 7min find the promo
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Dexter is forced to play dodgeball by his P. E. teacher. Constantly failing, Dexter builds a robotic exoskeleton to defend himself.
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S01E05 Dial M for Monkey: Rasslor
May 5 · 7min find the promo
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Intergalactic wrestling champion Rasslor challenges Earth's superheroes, including Monkey, with the planet's fate at stake.
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S01E06 Dexter's Assistant
May 5 · 7min find the promo
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In need of an assistant to operate his latest invention, Dexter performs a brain transplant on Dee Dee to make her smart enough to fulfill the role. With her new brain, Dee Dee proves to be more intelligent than Dexter.
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S01E07 Dexter's Rival
May 12 · 7min find the promo
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Mandark Astronomanov, a new student at Dexter's school, seems to be superior to Dexter academically. Mandark forces Dexter to shut down his lab so that Mandark's lab can gain more power. However, with the help of Dee Dee, Dexter manages to destroy Mandark's lab.
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S01E08 Dial M for Monkey: Simion
May 12 · 7min find the promo
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Monkey encounters Simion, an intelligent anthropomorphic chimpanzee who seeks vengeance on humans for turning him into his current state.
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S01E09 Old Man Dexter
May 12 · 7min find the promo
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Banned from watching a late-night movie due to his young age, Dexter uses his technology to artificially grow into adulthood, but Dee Dee tampers with his machine, causing Dexter to turn into an old man.
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S01E10 Double Trouble
May 19 · 7min find the promo
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Dee Dee and her friends, Lee Lee and Mee Mee, enter Dexter's lab and wreak havoc. Dexter clones himself to stop them, but the girls too make clones of themselves.
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S01E11 Dial M for Monkey: Barbequor
May 19 · 7min find the promo
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Monkey's birthday party is interrupted by Barbequor an intergalactic villain who plans to eat the planets, and his sidekick, the Silver Spooner.
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S01E12 Changes
May 19 · 7min find the promo
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Rerun of "Dexter's Laboratory", the first "What a Cartoon!" pilot.
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S01E13 Jurassic Pooch
May 26 · 7min find the promo
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To clone a dinosaur with an incomplete DNA sequence, Dexter uses his dog's genetic code to fill in the gaps.
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S01E14 Dial M For Monkey: Orgon Grindor
May 26 · 7min find the promo
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While on a date with Agent Honeydew, Monkey gets hypnotized by the music of the Organ Grindor who commands him to rob Fort Knox.
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S01E15 Dimwit Dexter
May 26 · 7min find the promo
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Due to overworking his brain, Dexter's mind shuts down, making him act idiotic.
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S01E16 Dee Dee's Room
June 2 · 7min find the promo
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After Dee Dee steals his critical invention, Dexter ventures into her room to find it.
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S01E17 Dial M For Monkey: Huntor
June 2 · 7min find the promo
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Monkey encounters an alien hunter named Huntor and must fight him to save Agent Honeydew and Commander Chief.
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S01E18 The Big Sister
June 2 · 7min find the promo
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Rerun of the second "What a Cartoon!" pilot.
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S01E19 Star Spangled Sidekicks
November 20 · 7min find the promo
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Dexter and Dee Dee enter tryouts to become Major Glory's sidekick. When Dee Dee wins, Dexter realizes that fancy costumes are not the only criterion to become a superhero.
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S01E20 The Justice Friends: TV Super Pals
November 20 · 7min find the promo
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With only one television in their apartment, Major Glory, Krunk, and Valhallen disagree on what to watch: Major Glory's televised capture of the Disgruntled Postman, TV Puppet Pals, or the monster truck pull.
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S01E21 Game Over
November 20 · 7min find the promo
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Dexter and Dee Dee's father buys a video game for them to play, but the game sucks Dexter inside when he plugs in the cartridge, and it is up to Dee Dee to bring him out.
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S01E22 Babysitter Blues
November 27 · 7min find the promo
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Dexter has a crush on his teenage babysitter Lisa. When he finds out that she has a boyfriend, he sabotages their relationship and accelerates his age by ten years in an attempt to win her heart.
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S01E23 The Justice Friends: Valhallen's Room
November 27 · 7min find the promo
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Valhallen loses his magic ax and starts turning into a nerd, forcing Major Glory and Krunk to enter his room to find it.
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S01E24 Dream Machine
November 27 · 7min find the promo
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When Dexter's nightmares become frequent and problematic, he invents a machine that allows him to have nice dreams, as long as Dee Dee can operate it properly while she is awake.
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S01E25 Dollhouse Drama
December 4 · 7min find the promo
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Suspicious that Dee Dee has not entered his lab even once on a particular day, Dexter shrinks himself and enters her room to spy on her. He soon becomes an unwilling character in Dee Dee's doll story, but he believes the story to be real.
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S01E26 The Justice Friends: Krunk's Date
December 4 · 7min find the promo
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While fighting Comrade Red and his gang, Krunk falls in love with his equivalent in their gang, She-Thing.
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S01E27 The Big Cheese
December 4 · 7min find the promo
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Dexter's new device allows him to study for the next day's French test while sleeping. It malfunctions, causing a single phrase -omelette du fromage- to repeat throughout the night, causing Dexter to wake up the next morning speaking nothing else except "omelette du fromage".
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S01E28 Way of the Dee Dee
December 11 · 7min find the promo
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Dee Dee teaches Dexter how to live life her way instead of being lonely and purely focused on science.
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S01E29 The Justice Friends: Say Uncle Sam
December 11 · 7min find the promo
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Major Glory forces Krunk and Valhallen to tidy up their apartment for his Uncle Sam, who is coming over for a visit.
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S01E30 Tribe Called Girl
December 11 · 7min find the promo
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To learn more about girls, Dexter camouflages himself and enters Dee Dee's room, where she is having a sleepover with her friends Lee Lee and Mee Mee. He gets caught by the girls, who force him to take part in their activities.
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S01E31 Spacecase
December 18 · 7min find the promo
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To prevent himself from being taken away by aliens for experimentation, Dexter tricks Dee Dee into going instead, but he regrets his decision after realizing how much he cares for her.
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S01E32 The Justice Friends: Ratman
December 18 · 7min find the promo
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To fix their apartment's plumbing, Krunk and Valhallen go to the basement, where they meet Ratman, a diminutive vigilante raised by rats (a parody of Batman).
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S01E33 Dexter's Debt
December 18 · 7min find the promo
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Dexter's lab is threatened with repossession unless he can repay his debt to NASA. When Dee Dee wins the same amount in a lottery, he decides to steal her money out of desperation.
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S01E34 The Justice Friends: Bee Where?
December 25 · 7min find the promo
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Major Glory, Krunk, and Valhallen try to rid their apartment of a bee.
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S01E35 Mandarker
December 25 · 7min find the promo
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Following the destruction of his lab by Dexter and Dee Dee (in the episode Dexter's Rival), Mandark turns to magic to beat Dexter at the science fair.
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S01E36 Inflata Dee Dee
January 1 · 7min find the promo
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Dee Dee inflates Dexter's hydro-plasmatic suit and constantly floats in the air, prompting Dexter to bring her down.
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S01E37 The Justice Friends: Can't Nap
January 1 · 7min find the promo
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After fellow Justice Friend White Tiger helps Valhallen stop a super-villain, the latter invites him to spend the night in his apartment, forgetting that Major Glory is allergic to cats.
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S01E38 Monstory
January 1 · 7min find the promo
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Not interested in hearing Dee Dee's long-winded story, Dexter gives her a silencing formula to keep her quiet, but it instead turns her into a giant monster still bent on telling her story. When he realizes that nothing can make her quiet, he becomes a giant monster himself.