Dexter's Laboratory
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48 free Dexter's Laboratory trivia questions with answers — entertainment quiz, new questions added Oct 2026.
Dexter's Laboratory started as a two-and-a-half-minute pencil test by a CalArts student who had learned English from cartoons. Within a few years it was Cartoon Network's highest-rated show, the first of the Cartoon Cartoons, and the series that launched Genndy Tartakovsky toward Samurai Jack and Clone Wars. The setup never changed: a tiny boy genius with an unexplained accent, a vast secret lab behind the bookcase, and an older sister who wanders in and presses the button. This quiz covers the show's four seasons and 78 episodes, the Dial M for Monkey and Justice Friends segments, the Ego Trip movie that was supposed to end it all, the episode that was never broadcast because of swearing, the balloon in the Macy's parade, and the voice actors, including the Utah-born performer who was also the pig in Babe. Fifty questions from easy to hard, each sourced and each explanation adding one more thing you didn't know about the lab.
30 of 48 questions with answers and explanations. Play the quiz
Q 01Who created Dexter's Laboratory?
Genndy Tartakovsky
Genndy Tartakovsky. He meant to study advertising, but those classes were full when he registered, so he took an animation elective and fell in love with it.
Q 02What kind of performer is Dexter's older sister dressed as throughout Dexter's Laboratory?
A ballerina
A ballerina. She came first: for a college assignment the creator animated a tall, dancing girl, then drew a short, blocky scientist as her opposite.
Q 03Where does Dexter keep his secret laboratory?
In his bedroom
In his bedroom. It is hidden behind a bookcase, and his sister keeps getting in and wrecking his experiments.
Q 04Dexter's Laboratory began as a 1995 short in which Cartoon Network showcase for new cartoons?
What a Cartoon!
What a Cartoon! Dexter's short won a popular vote in 1995 and became the first of the showcase's 48 cartoons to earn a series of its own.
Q 05Dexter's Laboratory was the first series under which Cartoon Network brand for its original shows?
Cartoon Cartoons
Cartoon Cartoons. Most of the shows that later carried the label started the same way Dexter's did: as a pilot short.
Q 06In Dexter's Laboratory, a sleep-learning mishap leaves Dexter able to say only which French phrase?
Omelette du fromage
Omelette du fromage. The phrase makes him a celebrity, until he gets home and can't speak the password to his lab, which blows up in his face.
Q 07Which future creator of The Loud House ran Dexter's Laboratory when it returned in 2001?
Chris Savino
Chris Savino. The show's creator was busy launching his next series, so Savino took over as creative director and, by the final season, as producer.
Q 08In 'Last But Not Beast', planned as the last Dexter's Laboratory episode, Dexter is an exchange student in which country?
Japan
Japan. There he accidentally frees a giant monster from a volcano, and the show's superheroes are flattened before his own family helps him stop it.
Q 09Who was the original voice of Dexter in Dexter's Laboratory?
Christine Cavanaugh
Christine Cavanaugh. She retired to Utah in 2001, partway through the show's return, which is why Dexter sounds different in the final seasons.
Q 10Which voice of Cheese in Foster's Home for Imaginary Friends took over as Dexter in Dexter's Laboratory?
Candi Milo
Candi Milo. She stepped in during season three when the original actress retired, and was still playing him in 2025, in a Jellystone! crossover special.
Q 11What is Dexter's pet monkey secretly?
A crime-fighting superhero
A crime-fighting superhero. Dexter keeps running experiments to give Monkey powers and never notices that he already has them.
Q 12Who is Monkey's partner in Dial M for Monkey?
Agent Honeydew
Agent Honeydew. A date of theirs goes wrong when a villain's hypnotic organ music lures Monkey away and he is ordered to rob Fort Knox.
Q 13Which trio of flat-sharing superheroes has its own segment in Dexter's Laboratory?
The Justice Friends
The Justice Friends. The creator later named it the one project that fell short of what he pictured, saying it 'could have been funnier'.
Q 21Which superhero cartoon gave the creator of Dexter's Laboratory an early job in Madrid?
Batman: The Animated Series
Batman: The Animated Series. After two years at art school he took the job, then joined Hanna-Barbera, where Dexter took shape.
Q 22On which Hanna-Barbera cartoon was the creator of Dexter's Laboratory a storyboard artist in the early 1990s?
2 Stupid Dogs
2 Stupid Dogs. A producer on it saw his student pencil test of Dexter and took it to the young Cartoon Network, which is how the boy genius got a pilot.
Q 23In Dexter's Laboratory, Dad turns wild at the smell of which of Mom's baked treats?
Muffins
Q 14Which superhero in Dexter's Laboratory wields an electric guitar and talks like a Shakespearean surfer?
Valhallen
Valhallen. He is a send-up of Thor: the creator learned English partly from superhero comics, and they inspired the whole segment.
Q 15What colour is the Infraggable Krunk?
Purple
Purple. The childlike strongman spoofs the Hulk with the colours swapped: purple skin and torn green trousers.
Q 16A Dexter's Laboratory episode pairs the planet-eating Barbequor with a spoon-riding herald who spoofs which comic-book hero?
Silver Surfer
Silver Surfer. The Silver Spooner's episode aired in 1996 and was then pulled from reruns; the US season one DVD carries 'Dexter's Lab: A Story' in its place.
Q 17A six-year-old fan sent in his Dexter's Laboratory episode idea as what?
An audio cassette
An audio cassette. The producers animated straight over Tyler Samuel Lee's recording, so the boy himself narrates the finished episode and voices Dexter in it.
Q 18The Dexter's Laboratory short 'Chicken Scratch' preceded which film in cinemas?
The Powerpuff Girls Movie
The Powerpuff Girls Movie. In the short Dexter catches chickenpox, can't stop scratching and turns into a chicken; it reached television 16 months later.
Q 19In which city was the creator of Dexter's Laboratory born?
Moscow
Moscow. His family left when he was a boy, fearing anti-Semitism, and he said he learned English fast because he was hooked on American television.
Q 20At which art school did the creator of Dexter's Laboratory make the student films behind the show?
California Institute of the Arts
California Institute of the Arts. He called it a 'mystical Disney school' he never expected to get into; once there, a homework assignment gave him Dexter.
Muffins. In 'The Muffin King', Dexter and his sister are told to guard a fresh batch while Mom is out shopping, and Dad hunts it like an animal.
Q 24The Dexter's Laboratory episode 'Mock 5' is a send-up of which classic racing cartoon?
Speed Racer
Speed Racer. The title puns on the hero's car, the Mach 5, and Dexter takes the wheel in a soapbox derby down Volcano Mountain against his rival.
Q 25In Dexter's Laboratory, which wrestling star voices Rasslor, a cosmic champion who challenges Earth's heroes?
Randy Savage
Randy Savage. The 'Macho Man' plays an alien champion who stakes the planet's fate on a wrestling match and flattens one superhero after another.
Q 26The Dexter's Laboratory episode 'LABretto' retells Dexter's life story in the style of what?
An opera
An opera. The title folds 'lab' into 'libretto', an opera's sung text, and the story runs from Dexter's birth to the building of his secret laboratory.
Q 27Which real first name does Dexter's rival Mandark hide in Dexter's Laboratory?
Susan
Susan. The secret comes out in an origin episode titled after Johnny Cash's 'A Boy Named Sue', which shows him growing up as the child of hippies.
Q 28Why does Dexter have an accent, by his creator's account?
All well-known scientists have accents
All well-known scientists have accents, he joked. It also echoes his own childhood: classmates mocked the thick accent he had as a young immigrant.
Q 29The sibling rivalry in Dexter's Laboratory was modelled on its creator's relationship with whom?
His older brother Alex
His older brother Alex. The twist is that the creator was the pest: Alex guarded his intricate toy soldiers just as Dexter guards his lab.
Q 30Jeff Bennett, the voice of Dad in Dexter's Laboratory, also voices which Cartoon Network title character?
Johnny Bravo
Johnny Bravo. Bennett won the part with an Elvis Presley impression, and the muscle-bound charmer began as a pilot short in the same showcase as Dexter.