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
After a fright from Dee Dee, Dexter lays down in the beard growing machine and tries to grow a beard like his hero, Action Hank. Unfortunately, everyone thinks he's a hero.
Directed by Genndy TartakovskyGuest stars Kevin Michael Richardson, Kimberly Brooks, Tom Kenny
Episode 2
Mandark doesn't know that his pet duck is really Quackor the Fowl, Monkey's rival. Quackor overhears Mandark talking in his sleep about destroying Dexter's lab and tries to do it, unaware that Monkey is Dexter's pet.
Directed by Genndy TartakovskyGuest stars Eddie Deezen, Frank Welker, Tom Kenny
Episode 3
Dexter prevents Dee Dee from destroying some ants. In order to teach her about ants, Dexter and Dee enter Dexter's ant farm. The ants think Dexter is a criminal and has him fight to the death with a stronger ant.
Directed by Genndy TartakovskyGuest stars Tom Kenny
Episode 4
Dexter switches his brain with a mouse, and must avoid his mother when she decides to exterminate him. A Parody of Tom and Jerry.
Directed by Robert Alvarez
Episode 5
At the Chubby Cheese pizza restaurant, Dexter wears a Chubby Cheese hat and tries to slow down the Whack The Weasel machine to win a stuffed Monkey doll before Dee Dee does.
Directed by Rob RenzettiGuest stars Rob Paulsen, Tom Kenny
Episode 6
One of Dexter's robots becomes Dee Dee's servant when she removes a wrench that froze him up, but the robot is willing to destroy anyone who is mean to her or scolds her, including Dexter.
Directed by Rob RenzettiGuest stars Frank Welker, Kimberly Brooks
Episode 7
When Dexter's friends tire of the complicated traps he sets up as Dungeon Master (he has their character's killed every time), they put Dee Dee in charge for a change of pace.
Directed by Genndy TartakovskyGuest stars Dee Bradley Baker, Frank Welker, Michael Conner
Episode 8
Dexter's father gets challenged to an arm wrestling match against a local champion at a truck stop, when he causes the champion to lose for the first time, but refuses to do so even when he trashes the family car. He finally accepts the challenge when he slams the door in Mom's face. Dee Dee knows he'll get creamed, so Dexter builds him a robotic arm to help him win the match.
Directed by Genndy Tartakovsky, Rob RenzettiGuest stars Tom Kenny, Frank Welker
Episode 9
Dexter uses radiation therapy so he can like vegetables, it actually causes him to only eat vegetables, also, the therapy has consequences if Dexter goes too long without them. He turns into a Parody of The Incredible Hulk without vegetables.
Directed by Rob Renzetti
Episode 10
Dee Dee's imaginary friend comes to life and annoys Dexter. Dexter ends up wishing him away, then he realizes he made a terrible mistake.
Directed by Robert AlvarezGuest stars Dom DeLuise
Episode 11
Dexter oversleeps and still has to finish his homework along with getting ready for school and eating breakfast, so he creates a helmet that expands thirty seconds into thirty minutes, but realizes that slowing down time is more detrimental than helpful. When he gets everything done, the helmet shuts off. But Dee Dee blocks his door causing him to miss the bus. When Dexter asks Dee Dee why, she replies "Snow Day, school's canceled!". Dexter realizes he did all that rushing around for nothing!
Directed by Rob Renzetti
Episode 12
Dee Dee Locks and the Ness Monster—Dexter's mother forces Dexter to read to Dee Dee when she's sick, but she makes up her own story after being bored by Dexter's story (which was actually a science article). The story is completely mixed up and makes no sense. Dexter ends up catching Dee Dee's illness.
Directed by Genndy Tartakovsky, Robert AlvarezGuest stars Tom Kenny, Rob Paulsen
Episode 13
Dexter fuses Dee Dee with the family car by accident, causing mayhem. A Parody of Herbie the Love Bug.
Directed by Rob Renzetti
Episode 14
Dexter accidentally takes a library book without checking it out, so he and Dee Dee try to put it back without being caught.
Directed by Robert AlvarezGuest stars Tom Kenny
Episode 15
Dee Dee's new dance annoys Dexter to no end.
Directed by Genndy TartakovskyGuest stars Jeff Coopwood
Episode 16
Dexter calls upon the "shoe gnomes" to repair his boots, but can't rid himself of them afterwards. The only way to get rid of them, according to Dee Dee, is to kick them in the butt. Dexter gets rid of the last one with his boot, but it's damaged again.
Directed by Rob RenzettiGuest stars Tom Kenny, Rob Paulsen
Episode 17
Dexter ends up in the "old part of the lab" where his earliest inventions, long since forgotten, are not too happy to see him. They are mad at him for saying they were his greatest inventions, then moved on to another great invention.
Directed by Genndy TartakovskyGuest stars Tom Kenny, Frank Welker
Episode 18
Dexter and Dee Dee label everything in the house. When their parents get home, they mistake Dexter for Dee Dee (he had a Dee Dee label on his forehead), but he already blamed Dee Dee for the chaos.
Directed by Rob RenzettiGuest stars Tom Kenny, Rob Paulsen, Frank Welker
Episode 19
Dexter and Dee Dee compete against each other on a game show. Where Dexter can't seem to win.
Directed by Robert AlvarezGuest stars Rob Paulsen
Episode 20
Dexter tries to inject himself into Dee Dee to find a cure to the common cold, but ends up inside his dog. He believes Dee Dee has been infected with a dog virus. He is then mistaken for the first human virus to infect a dog by the vet.
Directed by Robert AlvarezGuest stars Frank Welker
Episode 21
When Dee Dee refuses to flush their gold fish down the toilet, the ghost of the fish haunts them.
Directed by Genndy Tartakovsky
Episode 22
Dee Dee and Dexter win a free pass to Professor Hawk's magic factory after finding the golden diskette.
Directed by Genndy TartakovskyGuest stars Randy Crenshaw, Roger Freeland, Don Shelton, Tom Kenny
Episode 23
Dad encourages Dexter to become the king of snow, as he was in his early days, until someone beated him.
Directed by Genndy Tartakovsky, Robert Alvarez
Episode 24
In an attempt to be popular with his ""friends"", Dexter makes his own Mayor Glory Action Figure.
Directed by Rob RenzettiGuest stars Rob Paulsen, Tom Kenny
Episode 25
In a whole parody of ""Speed Racer"", Dexter and Mandark compete on a race.
Directed by Genndy Tartakovsky, Rob RenzettiGuest stars Eddie Deezen, Frank Welker, Tom Kenny
Episode 26
Dexter can't get into a roller coaster because he's too small so he makes himself taller.
Directed by Rob RenzettiGuest stars Tom Kenny
Episode 27
Dee Dee steals the nuclear atom that Dexter needs to make his invention work, but she doesn't know that it will explode if Dexter doesn't find it on time.
Directed by Robert Alvarez
Episode 28
Everybody except Dexter gets sick, so he makes himself a plastic bubble to get germ protection.
Directed by Genndy Tartakovsky, Robert Alvarez
Episode 29
It's not a great day for science when Dexter has bad luck due to the position of the stars.
Directed by Rob Renzetti
Episode 30
Mom makes Dexter go outside and ride a bike, thing that turns into a Dexter-Dee Dee chase.
Directed by Rob Renzetti
Episode 31
While at the beach, Dee Dee (who's wearing a mermaid swimsuit) gets captured by a maniac sailor so Dexter must rescue her.
Directed by Rob RenzettiGuest stars Tom Kenny, Rob Paulsen
Episode 32
Dexter must go to the back of the school bus to retrieve his pencil, where another kid got lost years ago.
Directed by Genndy Tartakovsky, Rob RenzettiGuest stars Tom Kenny, Kimberly Brooks, Rob Paulsen
Episode 33
Krunk stays awake all night watching The Puppet Pals Show Marathon, so his brain starts playing him tricks.
Directed by Genndy TartakovskyGuest stars Rob Paulsen, Frank Welker, Tom Kenny
Episode 34
Dexter is sent to summer camp, in a place far away from civilization.
Directed by Genndy Tartakovsky, Robert AlvarezGuest stars Tom Kenny, Candi Milo
Episode 35
While the family is at the woods, Dexter goes searching for the Mighty Bigfoot, if Dee Dee doesn't find him first.
Directed by Genndy TartakovskyGuest stars John Garry
Episode 36
Dee Dee photographs Dexter's secret lab.
Directed by Genndy Tartakovsky, Robert AlvarezGuest stars Tom Kenny, Jim Cummings
Episode 37
Dexter and two friends go to the Star Check Convention, but certain confusion might send them to a different one.
Directed by Rob RenzettiGuest stars Tom Kenny, Rob Paulsen
Episode 38
To avoid the bath, Dexter decides to laminate himself.
Directed by Genndy Tartakovsky
Episode 39
Dexter will do anything to make the ice cream vendor stop to get some ice cream.
Directed by Robert AlvarezGuest stars Tom Kenny
Episode 40
Dexter and Dee Dee get their Action Hank and Pony Puff Secret Codes mixed up.
Directed by Genndy Tartakovsky, Robert AlvarezGuest stars John Garry, Tom Kenny
Episode 41
Dexter newest creation gives Mom super powers.
Directed by Rob RenzettiGuest stars Tom Kenny
Episode 42
Dexter's robot takes over his lab.
Directed by Robert AlvarezGuest stars Tom Kenny
Episode 43
Dexter heals a turtle by giving him loads of modern, techno stuff.
Directed by Rob RenzettiGuest stars Kimberly Brooks
Episode 44
Dexter makes himself invisible to make sure Mom and Dad give him what he wants for his birthday, the Ultimate Mayor Glory Action Figure.
Directed by Robert AlvarezGuest stars Rob Paulsen
Episode 45
Dexter and Dee Dee go to South America in order to find the chupacabras, an animal that Dexter created.
Directed by Genndy Tartakovsky, Robert AlvarezGuest stars Rob Paulsen, Tom Kenny
Episode 46
Dee Dee, who's not exactly good at singing, gets Dexter's help on getting a better voice, but not the voice Dexter was expecting.
Directed by Genndy TartakovskyGuest stars Kevin Michael Richardson, Randy Crenshaw, Roger Freeland, Steve Lively
Episode 47
When Dexter's favorite show gets interrupted by an emergency, he searches all town trying to find it and solve so regular broadcast returns.
Directed by Genndy Tartakovsky, Rob RenzettiGuest stars Kevin Michael Richardson, Tom Kenny, Rob Paulsen
Episode 48
Dexter and Dee Dee go to the dumps to retrieve Dee Dee's lost teddy bear.
Directed by Robert AlvarezGuest stars Tom Kenny
Episode 49
Dexter and Dee Dee get trapped with a Finger trap.
Directed by Genndy Tartakovsky, Robert AlvarezGuest stars James Hong
Episode 50
Dexter and Dee Dee must stop Dad from eating Mom's muffins.
Directed by Genndy Tartakovsky
Episode 51
Dexter finds out he's ugly, so he transforms his face to look better for the school photo.
Directed by Genndy Tartakovsky
Episode 52
Dexter combines himself with bubble gum to become more stretchable.
Directed by Genndy Tartakovsky
Episode 53
Dexter is send to detention after a confusion during a test.
Directed by Rob RenzettiGuest stars Michael Pataki, Tom Kenny
Episode 54
Dexter and Dee Dee want to become older, but instead they make everyone else a baby.
Directed by Genndy Tartakovsky, Robert Alvarez
Episode 55
A new female villian named Peltra wants Monkey's Coat.
Directed by Genndy TartakovskyGuest stars Frank Welker, Earl Boen, DeeDee Rescher, Tom Kenny
Episode 56
Dee Dee, LeeLee and MeeMee become crimefighters, but of course they will not actually fight crime.
Directed by Rumen PetkovGuest stars Kimberly Brooks, Tom Kenny
Episode 57
Dad wants to show Dexter the joy of sports.
Directed by Genndy Tartakovsky, Rob Renzetti
Episode 58
Koosy tells Dee Dee that he is the king of the land of Koos, but when Dee Dee goes there...
Directed by Genndy TartakovskyGuest stars Dom DeLuise, Rob Paulsen, Tom Kenny
Episode 59
Dee-Dee refuses any kind of help from Dexter on her science project, when Dee-Dee shows Dexter her show-and-tell product, he criticises it heavily and offers his own..contributions
Directed by Robert Alvarez
Episode 60
Surprised of the results coffee causes on Mom and Dad, Dexter and Dee Dee decide to try it themselves.
Directed by Genndy Tartakovsky
Episode 61
Dexter uses his science to turn Dee Dee into a horse.
Directed by Rumen PetkovGuest stars Kimberly Brooks
Episode 62
Dexter overloads the energy of the laboratory, so he makes numerous tries to reload it.
Directed by Rumen Petkov
Episode 63
After Dexter did something really bad at school, he gets her mother called, so to not ruin his reputation, he turns Dee Dee into Mom.
Directed by Genndy Tartakovsky, Rob RenzettiGuest stars Tom Kenny
Episode 64
After Dexter gets bitten by a clown, he turns into one every night.
Directed by Genndy Tartakovsky, Robert AlvarezGuest stars Tom Kenny
Episode 65
On his way home, Dexter gets followed by a labrador, when he teaches him to speak, the dog becomes even more annoying.
Directed by Genndy TartakovskyGuest stars Frank Welker
Episode 66
A confusion at the supermarket makes Dexter go home with a different, yet extremely scientific, family; but who is home with his real family?
Directed by Rumen Petkov
Episode 67
Dexter is afraid of taking a dive at the pool because Dad always pushes him.
Directed by John McIntyreGuest stars Kimberly Brooks
Episode 68
After Dexter eats a giant burrito he believes he's going to die, so he makes a list of everything he must do before that time comes. (Including, make Mom and Dad happy, do dishes, free Robots, make World Peace, end World's hunger, learn to dance, make Dee Dee happy, shut down the Main System... and tell Mom and Dad about the secret laboratory).
Directed by Rumen Petkov
Episode 69
Dexter and Mandark must team up in order to save the Earth from a meteor rain.
Directed by John McIntyreGuest stars Eddie Deezen, Frank Welker
Episode 70
After an I.Q. test defines Dexter as ""average"", he decides to live an average life hanging out with an average boy of last name Smith.
Directed by Rumen PetkovGuest stars Frank Welker, Tom Kenny, Rob Paulsen
Episode 71
Dexter and Mandark mechanize the giant figures of Lincoln and Washington from the Mount Rushmore statues and wreak havoc with them.
Directed by Genndy TartakovskyWritten by Genndy TartakovskyGuest stars Eddie Deezen, Tom Kenny, Frank Welker, Maurice LaMarche
Episode 72
Dexter creates a small bug that eats all the scrap metal caused by Dee Dee's destruction.
Directed by John McIntyre
Episode 73
Dexter's untested formula causes all plants in the garden to become dangerous.
Directed by Rumen PetkovGuest stars Frank Welker
Episode 74
After Dexter returns a bunny to a little girl with big round eyes, she starts following Dexter everywhere.
Directed by Genndy Tartakovsky
Episode 75
After Dexter ""fires"" Dee Dee, he realizes that his lab needs chaos.
Directed by Genndy Tartakovsky, John McIntyre
Episode 76
Dexter travels to the past to meet the caveman that discovered fire.
Directed by Genndy TartakovskyGuest stars Frank Welker
Episode 77
Dexter attempts to make numerous accidents to get super powers.
Directed by Rumen PetkovGuest stars Tom Kenny
Episode 78
Dexter goes to Mars to find alien life forms.
Directed by John McIntyreGuest stars Tom Kenny
Episode 79
Dee Dee and the Ninja Clan battle for who delivers the newspapers in the neighborhood.
Directed by John McIntyreGuest stars Rob Paulsen
Episode 80
After Dexter and Dee Dee destroy Dad's bowling trophy, they are sent to each other's room.
Directed by John McIntyre
Episode 81
Dee Dee builds a treehouse in the garden and Dexter can't stop wondering what's up there.
Directed by Rumen Petkov
Episode 82
Dexter worked all night on his inventions so all he wants is some sleep, but Dee Dee will make sure that that doesn't happen.
Directed by Genndy Tartakovsky, Rumen PetkovWritten by Chris Savino
Episode 83
Dexter and his friends Lucky and Pierre(¿?) are victims of a bully that hates kids with funny accents.
Directed by John McIntyreGuest stars Jennifer Hale, Dee Bradley Baker, Rob Paulsen, Tom Kenny
Episode 84
Numerous factors like getting up early, being the first ones there, fishing clothes and other accesories, will not allow Dexter and his Dad to go on a fishing trip.
Directed by Rumen PetkovGuest stars Dee Bradley Baker
Episode 85
Constant interruptions by Dexter, Dee Dee and Mom will not let Dad watch his golf game.
Directed by John McIntyreGuest stars Tom Kenny
Episode 86
After Dexter breaks his glasses, he starts a new fashion at school.
Directed by Genndy TartakovskyGuest stars Eddie Deezen, Tom Kenny, Kimberly Brooks, Frank Welker
Episode 87
Dexter meets a bum at an appliance store with a strange device on his head.
Directed by John McIntyreGuest stars Tom Kenny
Episode 88
Dexter goes to the appliance store to buy a lightbulb for his lab.
Directed by Genndy Tartakovsky
Episode 89
Dexter takes piano classes from a man that looks a lot like Paul Williams.
Directed by John McIntyreGuest stars Paul Williams
Episode 90
When an electricist comes to repair the house, Dexter discovers that if he repairs the lab it will function perfectly.
Directed by Rumen Petkov
Episode 91
Dexter creates a belt that can have its wearer do everything backwards, only to get in trouble when Dee Dee manages to get control of the time directional switch.
Directed by John McIntyre
Episode 92
Dee Dee keeps getting into Dexter's lab even though Dexter keeps throwing her out.
Directed by Genndy Tartakovsky, Rumen Petkov
Episode 93
Mandark tries to impress Dee Dee by getting into a surfing contest.
Directed by Genndy Tartakovsky, Rumen PetkovGuest stars Eddie Deezen, Tom Kenny, Greg Eagles
Episode 94
Dexter makes Dee Dee a robot for herself, at the same time a volcano is going to burst on an island in the middle of the ocean.
Directed by Genndy Tartakovsky, Rumen Petkov
Episode 95
Dexter must save his family after they get possesed by aliens.
Directed by Genndy Tartakovsky, Rumen Petkov
Episode 96
Dee Dee must save Dexter who is a slave in a distant galaxy.
Directed by Genndy Tartakovsky
Episode 97
Dee Dee and Lalavava (Mandark's sister), compete on a ballet contest.
Directed by Genndy Tartakovsky, Rumen PetkovGuest stars Eddie Deezen
Episode 98
It's Mother's Day and Mom can't take that Dad, Dee Dee and Dexter do all the housework.
Directed by Genndy Tartakovsky, John McIntyre
Episode 99
Dexter and Dee Dee compete in various games chosen by Dexter.
Directed by Rumen Petkov
Episode 100
A documentary shows the secret lives of Dexter and Dee Dee, also known as Blackfoot and Slim.
Directed by John McIntyreGuest stars Tom Kenny
Episode 101
Dexter stays at school too much, forcing the janitor to stay as well, so he waits for a day in which Dexter has to leave early for an emergency, as he plans his revenge...
Directed by Genndy TartakovskyGuest stars Tom Kenny
Episode 102
Dexter must stop his mechanical parrot before his imitations reveal the secret of his lab.
Directed by Genndy Tartakovsky, Rumen Petkov
Episode 103
Dexter and Computress team up in order to shrink Mandark's head.
Directed by John McIntyreWritten by Tyler Samuel LeeGuest stars Tyler Samuel Lee, Gail G. Hiller Lee
Episode 104
Krunk gets a nacho stuck in his tooth and Mayor Glory wants to take it out himself while Valhallens insists on taking Krunk to the dentist.
Directed by Genndy TartakovskyGuest stars Tom Kenny, Rob Paulsen, Frank Welker
Episode 105
Dexter must prove to Dee Dee that Santa Claus doesn't exist.
Directed by Genndy Tartakovsky, Rumen Petkov
Episode 106
When Blue Falcon appears with a destroyed Dynomutt, Dexter decides to build a new one.
Directed by Genndy TartakovskyGuest stars Gary Owens, Frank Welker, Rob Paulsen
Episode 107
The story of how Dexter was born and how he built his lab, in the style of a musical.
Directed by Genndy TartakovskyGuest stars Agostino Castagnola
Episode 108
Dexter must save Japan from being destroyed by a monster, but his robot must be controlled by four people to function correctly, so Dexter must tell Dee Dee... and his parents.
Directed by Genndy TartakovskyGuest stars Eddie Deezen, Earl Boen, Greg Eagles, Tom Kenny, Rob Paulsen, Brian Tochi, Lauren Tom, Frank Welker
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)
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