TV series
He skips grades. She just skips
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.
Streaming, rental and purchase options
Checked Jul 22, 2026
Dexter's Laboratory is available to stream on Tubi in United States. You can also rent or buy it from Google Play, Amazon, Apple TV, and Fandango at Home. Use the direct links below to open the provider.
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.
Choose an episode, then use the watch options above for the show.
Episode 1
Dee-Dee has a new boyfriend who also likes science and Einstein, and soon the boy finds himself caught in a vicious tug of war...
Directed by Chris Savino, Don JudgeWritten by Walt DohrnGuest stars Pamela Adlon
Episode 2
Dexter is hit by a wrench while working on a device, and suffers amnesia, Dee Dee decides to mess with his head
Directed by Chris SavinoWritten by Kevin Kaliher
Episode 3
Dexter and Mandark drill underground to expand their labs, but end up overlapping each other's work. They secretly devise a plan to destroy each other.
Directed by Chris Savino, Don JudgeWritten by Clay MorrowGuest stars Eddie Deezen
Episode 4
Dee Dee accidentally breaks down Dexter's lab, and she tries to not and let him know its broken.
Directed by Chris Savino, Don JudgeWritten by Mark O'Hare
Episode 5
Dad wants cable really bad, so Dexter illegally pirates cable for him.
Directed by Chris SavinoWritten by Clay MorrowGuest stars Daran Norris
Episode 6
When Dexter becomes the head of a library, he inforces the rules really hard, driving everyone crazy.
Directed by Chris Savino, Don JudgeWritten by Mark O'HareGuest stars Rachael MacFarlane
Episode 7
Dee Dee learns a new game that can ""predict peoples futures"". She uses it on Dexter, and finds out that the game REALLY DOES predict peoples futures...
Directed by Chris SavinoWritten by Mike Stern
Episode 8
A Monster starts roaming Dexter's lab, although Dexter doesnt know its just Dee Dee, who ate an apple in a failed lab experiment.
Directed by Chris Savino, Don JudgeWritten by Gabe SwarrGuest stars Frank Welker
Episode 9
Dexte'rs father begins to sleepwalk, and accidently stumbles into Dexter's Lab
Directed by Chris Savino, Don JudgeWritten by Carlos Ramos
Episode 10
Dexter accidentally shrinks his parents, and puts them into a model of there house. Although the house isnt completed, so Dexter must find a way to reverse it before they know the truth.
Directed by Chris Savino, Don JudgeWritten by Clay Morrow
Episode 11
Dexter creates a new invention and wears it on his head. It suddenly becomes the latest fashion craze at Huber elementry.
Directed by Chris Savino, Don JudgeWritten by Chris ReccardiGuest stars Daran Norris, Dee Bradley Baker
Episode 12
Dexter and Dee Dee realise when they work together, they make a pretty good team.
Directed by Chris Savino, James T. WalkerWritten by Mark O'Hare
Episode 13
Dee Dee has a song stuck in her head. Literally.
Directed by Chris Savino, Don JudgeWritten by Kevin KaliherGuest stars Jess Harnell
Episode 14
Dee Dee's stuffed animals come to life and roam the house. Dee Dee and Dexter must get them before Mom and Dad find out.
Directed by Chris SavinoWritten by Gabe Swarr
Episode 15
Dexter creates an ink in which lets him command them to do whatever he wants them to do. Although when Mandark gets a hold of it, Dexter is the one being the slave.
Directed by Chris Savino, Don JudgeWritten by Carlos RamosGuest stars Eddie Deezen, Frank Welker
Episode 16
Decxter and Mandark are both outperformed by a new girl attending the school, jealous, they become allies to deal with her.
Directed by Chris Savino, Don JudgeWritten by Charlie BeanGuest stars Eddie Deezen, Tom Kenny, Lauren Tom, Frank Welker
Episode 17
Mom thinks she should spend quality time and watch Dexter in his chess comatition. Although, she really embarasses Dexter while hes there...
Directed by Chris Savino, Don JudgeWritten by Charlie BeanGuest stars Tom Kenny
Episode 18
Dad gets fired from his job, and has to do the same job Mom does. He realises it isnt as easy as it looks.
Directed by Chris Savino, Don JudgeWritten by Carlos Ramos
Episode 19
Dexter goes on a quest. His quest is to reach the bathroom before he explodes.
Directed by Chris SavinoWritten by Chris SavinoGuest stars Frank Welker
Episode 20
When Dexter realises the power of the potato, he redesigns his lab to work on it.
Directed by Chris Savino, Don JudgeWritten by Mark O'HareGuest stars Frank Welker, Tom Kenny
Episode 21
Dexter is tired of wearing glasses, so he uses laser surgery on his eyes to make him have 1/20 vision. Although, he learns than no human should be able to see THIS well...
Directed by Chris Savino, Don JudgeWritten by Bill Wray
Episode 22
Dee Dee goes over to Mandark's house to baby sit him, and Mandark likes that idea.
Directed by Robert Alvarez, Chris SavinoWritten by Mark O'HareGuest stars Eddie Deezen
Episode 23
Mandark drops technology and starts being more in touch with nature.
Directed by Chris Savino, Don JudgeWritten by Kevin KaliherGuest stars Eddie Deezen, Frank Welker
Episode 24
Dexter decides its better if him and Mandark work together, although in the end Dexter does all the work while Mandark does nothing
Directed by Chris Savino, Don JudgeWritten by Clay MorrowGuest stars Eddie Deezen
Episode 25
Dexter is tired of being short, since his old plan of growing himself didnt work, he decides to make everyone shorter than him.
Directed by Chris Savino, Don JudgeWritten by Kevin KaliherGuest stars Andy Suriano, Jason Marsden
Episode 26
This takes place in the future, where Old Man Dexter tells about his ""glory days"". And Old lady Dee Dee keeps on adding her opinions as well...
Directed by Robert Alvarez, Chris SavinoWritten by Clay Morrow
Episode 27
When Dee Dee accidentally chops off her pigtail, Dexter gives her some hair growth potion. Although when she uses it, her hair floods the entire house.
Directed by Chris Savino, Don JudgeWritten by Bobby LondonGuest stars Gary Owens
Episode 28
When Dexter's Computer gets Laryngitus, Dexter must find a replacement voice for her.
Directed by Robert Alvarez, Chris SavinoWritten by Charlie BeanGuest stars Tom Kenny, Jennifer Martin, Daran Norris
Episode 29
Dexter refuses to see that blonde's have more fun, so he dyes Dee Dee's hair to prove it.
Directed by Chris Savino, Don JudgeWritten by Aaron SpringerGuest stars Mindy Cohn
Episode 30
Dexter finds out that all of Mandark's plans are taken from a comic book. This way, he can get ready.
Directed by Chris Savino, Don JudgeWritten by Chris ReccardiGuest stars Eddie Deezen, Dee Bradley Baker
Episode 31
Dexter and his dad enter a Golf tournament, with Dad eager to get his hands on the Trophy, but there is one problem: he is hopeless at Golf, so Dexter decides to help with a remote controlled Golf ball
Directed by Chris Savino, Don JudgeWritten by Aaron SpringerGuest stars Daran Norris, Dee Bradley Baker
Episode 32
Dexter, Monkey, The Justice Freinds, Dee-Dee, her imaginary freind Coosie, Mandark, his parents, and Dexter's Parents participate in a cross-country race
Directed by Chris Savino, Don JudgeWritten by Chris ReccardiGuest stars Eddie Deezen, Dom DeLuise, Tom Kenny, Rob Paulsen, Frank Welker, Daran Norris
Episode 33
Monkey narrates a documentry of the future of Laboratories and sciences.
Directed by Chris Savino, Don JudgeWritten by Charlie BeanGuest stars Corey Burton
Episode 34
Dexter catches the chicken pox, and Dee Dee tells him a ridiculous tale that if he keeps scratching them, he will turn into an evil chicken. His nonstop scratching eventually does just that.
Directed by Genndy Tartakovsky
Episode 35
Dexters parents accidentally sell Dexter's latest invention, and it is bought by Mandark.
Directed by Chris Savino, Don JudgeWritten by Clay MorrowGuest stars Eddie Deezen
Episode 36
Dee Dee starts layin' down the Judo on Dexter, then Dexter learns how to fight back.
Directed by Chris SavinoWritten by Kevin Kaliher
Episode 37
Dexter falls in love with a new girl at his school, but decides to impress her with poetry rather than science.
Directed by Robert Alvarez, Chris SavinoWritten by Mark O'Hare
Episode 38
When Dee Dee sees an Ostrage at the Zoo, she wants one of her own as a pet.
Directed by Genndy Tartakovsky, Chris SavinoWritten by Genndy Tartakovsky
Episode information updated Jul 24, 2026
Christine CavanaughDexter (voice)
Kat CressidaDee Dee (voice)
Jeff BennettDad (voice)
Kath SoucieMom (voice)
Candi MiloDexter (voice)
Randy PoffoRasslor (voice)
Dom DeLuiseKoosalagoopagoop (voice)
Cartoon NetworkUnited States
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