Invader Zim
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50 free Invader Zim trivia questions with answers — trivia quiz, new questions added Oct 2026.
Invader Zim ran for only two seasons on Nickelodeon in the early 2000s, yet it never really went away. Jhonen Vasquez's cartoon about a loud, deluded alien sent to conquer Earth was darker, stranger and more sharply drawn than almost anything around it, and it grew into a cult favorite with a comic book continuation and a feature-length revival. This quiz covers the whole story: Zim and his malfunctioning robot GIR, the paranormal-obsessed Dib and his gloomy sister Gaz, the towering leaders Zim is desperate to impress, and the classmates, teachers and rival invaders caught in between. There are questions on memorable episodes, the actors behind the voices, the fights with network censors and the show's long afterlife. It is written for fans at every level. The opening questions are friendly to anyone who remembers the show from childhood, and later ones reward viewers who know the episodes, the cast and the production stories by heart.
30 of 50 questions with answers and explanations. Play the quiz
Q 01In Invader Zim, what disguise does the robot GIR wear in public, despite looking nothing like the real thing?
A green dog suit
A green dog suit fools most humans, even though GIR looks and acts nothing like a real dog.
Q 02Which Star Wars actor was originally hired to voice Zim for the Invader Zim pilot, only to be replaced?
Mark Hamill
Mark Hamill was dropped before Nickelodeon executives ever saw the pilot, because Jhonen Vasquez felt his voice was not right for the character.
Q 03Which planet is the home world of Zim and his conquering alien empire in Invader Zim?
Irk
Irk was the subject of a $2,000 Jeopardy! clue about the show in 2013, and none of the contestants could answer it.
Q 04Which company threatened to sue over the original name of Gaz's handheld game console in Invader Zim?
Nintendo
Nintendo objected to Game Slave Advanced, a spoof of its Game Boy Advance, so the handheld that Gaz is always playing was renamed the Game Slave 2.
Q 05Which holiday figure does Zim impersonate to take over the world in the series finale of Invader Zim?
Santa Claus
Santa Claus proves too much for Zim when his data-packed costume malfunctions and engulfs him, until Dib defeats it and launches it off the planet.
Q 06Bryan Konietzko, an art director on Invader Zim, went on to co-create which Nickelodeon series?
Avatar: The Last Airbender
Avatar: The Last Airbender owes its hero to the earlier job: Aang grew out of a character Konietzko first drew while working on Invader Zim.
Q 07Which streaming service released Invader Zim: Enter the Florpus, a film first made for Nickelodeon?
Netflix
Netflix picked up the distribution rights, a deal that the president of Viacom revealed on a conference call in May 2019, three months before the premiere.
Q 08Why do the Almighty Tallest assign Zim to a far-off mystery planet in Invader Zim?
To get rid of him
To get rid of him was the whole idea: the Tallest assumed the planet did not exist, and were dismayed when Zim reached Earth and set up a base.
Q 09How does Invader Zim spell the name of the local school where Zim spies on humans in disguise?
Skool
Skool is where the undercover Zim spends his days gathering intelligence, while he plots the conquest of Earth from his base at home.
Q 10Which everyday liquid does Dib find is harmful to Zim, starting a soaking feud in Invader Zim?
Water
Water is so harmful to Zim that after Dib splashes him with a puddle and a balloon, Zim vows to drench Dib in revenge.
Q 11In Invader Zim, what does Zim wear to pass as a human child?
A wig and contact lenses
A wig and contact lenses hide his antennae and alien eyes, and almost no one except Dib and his sister Gaz realizes that he is an alien.
Q 12In Invader Zim, the Almighty Tallest hastily build the robot GIR from spare parts found in what?
A trash can
A trash can supplied the parts, yet the faulty robot was handed to Zim as though it were a top-secret advanced model.
Q 13Which grim teacher of Zim and Dib's class in Invader Zim is often shown emerging from people's shadows?
Ms. Bitters
Q 21Which vengeful rival joins Zim's class in disguise and plots to hollow out Earth's core in Invader Zim?
Tak
Tak blames Zim for an accident that cost her the chance to become an Invader, and it takes Zim and Dib working together to stop her.
Q 22In Invader Zim, which clingy classmate does Zim befriend to seem normal, only to regret it almost immediately?
Keef
Keef was meant to meet a far grimmer end, but Nickelodeon vetoed it, so he is attacked by a squirrel and falls off a building instead.
Q 23Which floating sidekick appeared in only one Invader Zim episode because his debut story went unfinished?
Minimoose
Minimoose is voiced by creator Jhonen Vasquez and was due to be introduced in Nubs of Doom, a story the crew never got to finish.
Ms. Bitters hands out unreasonable punishments of her own invention, most often to Dib, and slinks around to the sound of a cicada.
Q 14In Invader Zim, Zim infects Dib with a virus that slowly turns him into which lunch meat?
Bologna
Bologna thrown by Dib had hurt Zim at lunch, and once both rivals catch the virus they are forced to work together on a cure.
Q 15In Invader Zim, what does Zim steal from other children so the school nurse will think he is human?
Their organs
Their organs start vanishing in Dark Harvest once Zim is sent to the school nurse and fears an exam will expose him; the director recalled a child fleeing a test screening in tears.
Q 16Which classroom pet does Zim turn into a colossal, city-wrecking monster in Invader Zim?
A hamster
A hamster seemed ideal because Zim believed its cuteness could control minds, but he lost command of it and had to team up with Dib to stop the rampage.
Q 17Which SpongeBob SquarePants cast member voices the scientist Professor Membrane in Invader Zim?
Rodger Bumpass
Rodger Bumpass, best known as Squidward, returned as the father of Dib and Gaz in the 2019 film, where the professor finally tells his son he is proud of him.
Q 18Which dark comic led a Nickelodeon producer to ask its creator to pitch what became Invader Zim?
Johnny the Homicidal Maniac
Johnny the Homicidal Maniac caught producer Mary Harrington's eye for its art style, though Vasquez was 22 and had never worked in animation.
Q 19Which breakfast food does GIR keep serving Zim while Dib watches by spy camera in Invader Zim?
Waffles
Waffles fill an episode that the animators first planned as the longest single shot in animation history, and most of it does play as one scene.
Q 20The two Almighty Tallest who jointly rule Zim's empire in Invader Zim are named for which pair of colors?
Red and Purple
Red and Purple share the throne because they are exactly the same height, in an empire where the tallest of each generation takes command.
Q 24To which planet was Zim banished before he abandoned his punishment to join the invasion in Invader Zim?
Foodcourtia
Foodcourtia is a planet-sized food court where Zim served as a lowly food service drone, until news of a second invasion made him walk out on his exile.
Q 25What is the name of Zim's small spaceship in Invader Zim, later a cameo in a Universal Studios ride?
Voot Cruiser
Voot Cruiser is also the vehicle Zim drives as a playable racer in the 2008 arcade game Nicktoons Nitro.
Q 26What codename does Dib use in the Swollen Eyeball, the secret paranormal society of Invader Zim?
Agent Mothman
Agent Mothman once had to get a permission slip signed by his famous father before the society would hear his presentation about Zim.
Q 27What is the name of Gaz's favorite restaurant, her pick for the Membrane family night out in Invader Zim?
Bloaty's Pizza Hog
Bloaty's Pizza Hog matters so much to Gaz that when Dib goes missing while fighting Zim, she rescues him herself to make the dinner on time.
Q 28Which lawn ornaments guard the yard of Zim's house in Invader Zim, firing lasers from their eyes?
Gnomes
Gnomes on the lawn are robots, part of a base that also includes two badly built parents meant to make Zim seem more human.
Q 29In Invader Zim, how does the disguised Zim explain away his green complexion to the humans around him?
A skin condition
A skin condition is all the cover story he needs, since the mindless populace of the show's satirical Earth rarely questions him.
Q 30Which actor, the original Doug Funnie and Stimpy, voiced Zim in the Invader Zim pilot?
Billy West
Billy West lost the part once the series was ordered, because Jhonen Vasquez thought he was too well known and wanted an unfamiliar voice.