Every season of Dexter's Laboratory ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Dexter's Laboratory!

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.

DeeDeemensional

Monkey must defend the city from a giant underground lava monster, Magmanamus, who cannot sleep because of the noise created by its residents.

Dial M for Monkey: Magmanamus

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.

Maternal Combat

Dexter is forced to play dodgeball by his P. E. teacher. Constantly failing, Dexter builds a robotic exoskeleton to defend himself.

Dexter Dodgeball

Intergalactic wrestling champion Rasslor challenges Earth's superheroes, including Monkey, with the planet's fate at stake.

Dial M for Monkey: Rasslor

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.

Dexter's Assistant

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.

Dexter's Rival

Monkey encounters Simion, an intelligent anthropomorphic chimpanzee who seeks vengeance on humans for turning him into his current state.

Dial M for Monkey: Simion

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.

Old Man Dexter

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.

Double Trouble

Monkey's birthday party is interrupted by Barbequor an intergalactic villain who plans to eat the planets, and his sidekick, the Silver Spooner.

Dial M for Monkey: Barbequor

Rerun of "Dexter's Laboratory", the first "What a Cartoon!" pilot.

Changes

To clone a dinosaur with an incomplete DNA sequence, Dexter uses his dog's genetic code to fill in the gaps.

Jurassic Pooch

While on a date with Agent Honeydew, Monkey gets hypnotized by the music of the Organ Grindor who commands him to rob Fort Knox.

Dial M For Monkey: Orgon Grindor

Due to overworking his brain, Dexter's mind shuts down, making him act idiotic.

Dimwit Dexter

After Dee Dee steals his critical invention, Dexter ventures into her room to find it.

Dee Dee's Room

Monkey encounters an alien hunter named Huntor and must fight him to save Agent Honeydew and Commander Chief.

Dial M For Monkey: Huntor

Rerun of the second "What a Cartoon!" pilot.

The Big Sister

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.

Star Spangled Sidekicks

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.

The Justice Friends: TV Super Pals

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.

Game Over

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.

Babysitter Blues

Valhallen loses his magic ax and starts turning into a nerd, forcing Major Glory and Krunk to enter his room to find it.

The Justice Friends: Valhallen's Room

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.

Dream Machine

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.

Dollhouse Drama

While fighting Comrade Red and his gang, Krunk falls in love with his equivalent in their gang, She-Thing.

The Justice Friends: Krunk's Date

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".

The Big Cheese

Dee Dee teaches Dexter how to live life her way instead of being lonely and purely focused on science.

Way of the Dee Dee

Major Glory forces Krunk and Valhallen to tidy up their apartment for his Uncle Sam, who is coming over for a visit.

The Justice Friends: Say Uncle Sam

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.

Tribe Called Girl

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.

Spacecase

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).

The Justice Friends: Ratman

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.

Dexter's Debt

Major Glory, Krunk, and Valhallen try to rid their apartment of a bee.

The Justice Friends: Bee Where?

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.

Mandarker

Dee Dee inflates Dexter's hydro-plasmatic suit and constantly floats in the air, prompting Dexter to bring her down.

Inflata Dee Dee

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.

The Justice Friends: Can't Nap

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.

Monstory

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.

Beard To Be Feared

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.

Quackor The Fowl

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.

Ant Pants

Dexter switches his brain with a mouse, and must avoid his mother when she decides to exterminate him. A Parody of Tom and Jerry.

Mom and Jerry

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.

Chubby Cheese

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.

That Crazy Robot

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.

D & DD

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.

Hamhocks and Armlocks

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.

Hunger Strikes

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.

The Koos is Loose

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!

Morning Stretch

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.

Dee Dee Locks and the Ness Monster

Dexter fuses Dee Dee with the family car by accident, causing mayhem. A Parody of Herbie the Love Bug.

Backfire

Dexter accidentally takes a library book without checking it out, so he and Dee Dee try to put it back without being caught.

Book 'Em

Dee Dee's new dance annoys Dexter to no end.

Sister's Got a Brand New Bag

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.

Shoo, Shoe Gnomes

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.

Lab of The Lost

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.

Labels

Dexter and Dee Dee compete against each other on a game show. Where Dexter can't seem to win.

Game Show

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.

Fantastic Boyage

When Dee Dee refuses to flush their gold fish down the toilet, the ghost of the fish haunts them.

Filet of Soul

Dee Dee and Dexter win a free pass to Professor Hawk's magic factory after finding the golden diskette.

Golden Diskette

Dad encourages Dexter to become the king of snow, as he was in his early days, until someone beated him.

Snowdown

In an attempt to be popular with his ""friends"", Dexter makes his own Mayor Glory Action Figure.

*Figure Not Included

In a whole parody of ""Speed Racer"", Dexter and Mandark compete on a race.

Mock 5

Dexter can't get into a roller coaster because he's too small so he makes himself taller.

Ewww That's Growth

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.

Nuclear Confusion

Everybody except Dexter gets sick, so he makes himself a plastic bubble to get germ protection.

Germ Warfare

It's not a great day for science when Dexter has bad luck due to the position of the stars.

A Hard Day's Day

Mom makes Dexter go outside and ride a bike, thing that turns into a Dexter-Dee Dee chase.

Road Rash

While at the beach, Dee Dee (who's wearing a mermaid swimsuit) gets captured by a maniac sailor so Dexter must rescue her.

Ocean Commotion

Dexter must go to the back of the school bus to retrieve his pencil, where another kid got lost years ago.

The Bus Boy

Krunk stays awake all night watching The Puppet Pals Show Marathon, so his brain starts playing him tricks.

The Justice Friends: Things That Go Bonk in the Night

Dexter is sent to summer camp, in a place far away from civilization.

Ol' McDexter

While the family is at the woods, Dexter goes searching for the Mighty Bigfoot, if Dee Dee doesn't find him first.

Sassy Come Home

Photo Finish

Dexter and two friends go to the Star Check Convention, but certain confusion might send them to a different one.

Star Check Unconventional

To avoid the bath, Dexter decides to laminate himself.

Dexter is Dirty

Dexter will do anything to make the ice cream vendor stop to get some ice cream.

Ice Cream Scream

Dexter and Dee Dee get their Action Hank and Pony Puff Secret Codes mixed up.

Decode of Honor

Dexter newest creation gives Mom super powers.

World's Greatest Mom

Ultrajerk 2000

Dexter heals a turtle by giving him loads of modern, techno stuff.

Techno Turtle

Dexter makes himself invisible to make sure Mom and Dad give him what he wants for his birthday, the Ultimate Mayor Glory Action Figure.

Surprise!

Dexter and Dee Dee go to South America in order to find the chupacabras, an animal that Dexter created.

Got Your Goat

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.

Dee Dee Be Deep

When Dexter's favorite show gets interrupted by an emergency, he searches all town trying to find it and solve so regular broadcast returns.

Dexter and Dee Dee go to the dumps to retrieve Dee Dee's lost teddy bear.

Down in the Dumps

Dexter and Dee Dee get trapped with a Finger trap.

Unfortunate Cookie

Dexter and Dee Dee must stop Dad from eating Mom's muffins.

The Muffin King

Dexter finds out he's ugly, so he transforms his face to look better for the school photo.

Picture Day

Dexter combines himself with bubble gum to become more stretchable.

Now That's a Stretch

Dexter is send to detention after a confusion during a test.

Dexter Detention

Dexter and Dee Dee want to become older, but instead they make everyone else a baby.

Don't Be a Baby

A new female villian named Peltra wants Monkey's Coat.

Dial M For Monkey: Peltra

Dee Dee, LeeLee and MeeMee become crimefighters, but of course they will not actually fight crime.

G.I.R.L. Squad

Dad wants to show Dexter the joy of sports.

Sports a Poppin'

Koosy tells Dee Dee that he is the king of the land of Koos, but when Dee Dee goes there...

Koos a la Goop a Goop

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

Project Dee Dee

Surprised of the results coffee causes on Mom and Dad, Dexter and Dee Dee decide to try it themselves.

Topped Off

Dexter uses his science to turn Dee Dee into a horse.

Dee Dee's Tail

Dexter overloads the energy of the laboratory, so he makes numerous tries to reload it.

No Power Trip

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.

The Best Seasons of Dexter's Laboratory

The Best Seasons of Dexter's Laboratory

Season 1

Season 2

Season 4

Season 3