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The following is a list of episodes in the first season of Invader Zim.

"Walk for Your Lives", the second segment of episode 16, was oddly not aired on the main Nickelodeon network, instead premiering (alongside a rerun of its partner episode, "Hobo 13") on Nicktoons TV.

Episodes[]

# Image Title Air date
1
Title-TheNightmareBegins
"The Nightmare Begins" March 30, 2001 Nickelodeon 1998
Hoping to never see him again, the Almighty Tallest send Zim on a "mission" to far off the Earth.
2
Title-BestestFriend
"Bestest Friend" April 13, 2001 Nickelodeon 1998
Zim adopts an annoying best friend in order to appear more human.
Title-Nanozim "NanoZIM" April 13, 2001 Nickelodeon 1998
Dib sneaks into Zim's base, taking pictures and putting them on a floppy disk. Hoping to erase Dib's memory of where he hid the disk, Zim surreptitiously enters Dib's body to erase this memory.
3
Title-ParentTeacherNight
"Parent Teacher Night" April 6, 2001 Nickelodeon 1998
Zim makes use of his robot parents at the school's parent-teacher conferences.
Title-WalkOfDoom "Walk Of Doom" April 6, 2001 Nickelodeon 1998
Zim updates GIR's guidance chip, which he tests out in the big city. Unfortunately, GIR has removed the chip, leaving the duo stranded.
4
Title-Germs
"Germs" April 20, 2001 Nickelodeon 1998
After watching a B-war movie, Zim becomes germophobic and dedicates his life to exterminating Earth's bacteria.
Title-DarkHarvest "Dark Harvest" April 20, 2001 Nickelodeon 1998
Zim harvests the organs of the school children to appear more human.
5
Title-AttackOfTheSaucerMorons
"Attack of the Saucer Morons" April 27, 2001 Nickelodeon 1998
A group of true believers steals Zim's ship and, after catching Zim trying to recover it, begin to worship him.
Title-TheWettening "The Wettening" April 27, 2001 Nickelodeon 1998
Zim searches for a water-proof paste to shade his water allergies so he can survive a water war with Dib.
6
Title-CareerDay
"Career Day" May 4, 2001 Nickelodeon 1998
It's career day at school and Dib has been paired with a paranormal investigator. However, after discovering Zim is molting due to an equinox, Dib tries to convince his mentor to help him destroy Zim forever.
Title-BattleDib "Battle-Dib" May 4, 2001 Nickelodeon 1998
Trying to get a permission slip signed, Dib must endure trials to gain access to his father.
7
Title-PlanetJackers
"Planet Jackers" August 31, 2001 Nickelodeon 1998
Zim attempts to stop two planet thieves who intend to burn the Earth in their sun for fuel, therefore ending his mission.
Title-RiseOfTheZitboy "Rise of the Zitboy" August 31, 2001 Nickelodeon 1998
Zim uses his hypnotic pimple to force Dib into revealing a weakness in Zim's base.
8
Title-InvasionOfTheIdiotDogBrain
"Invasion of the Idiot Dog Brain" August 24, 2001 Nickelodeon 1998
GIR's brain takes over the base's operating system, and uses it to travel to the local taco restaurant.
Title-BadBadRubberPiggy "Bad, Bad Rubber Piggy" August 24, 2001 Nickelodeon 1998
Zim sends a series of rubber piggies back into the past to stop Dib from meddling with his plans in the future, but the piggies end up causing trouble for Zim.
9
Title-ARoomWithAMoose
"A Room with a Moose" August 17, 2001 Nickelodeon 1998
Zim hijacks a school bus and sends it into a wormhole, at the end of which lies a very large moose.
Hamstergeddon Title Card "Hamstergeddon" August 17, 2001 Nickelodeon 1998
Zim turns the class pet into a Godzilla-like creature in order to kill everyone in the city, but must team up with Dib when the giant hamster attacks his base.
10
Title-PlagueOfBabies
"Plague of Babies" September 7, 2001 Nickelodeon 1998
Zim discovers that aliens who look like babies are living on Earth. When they decide to take Zim's ship to return to their homeworld, Zim must fend off the attack of "Giganto-Baby."
Title-BloatysPizzaHog "Bloaty's Pizza Hog" September 7, 2001 Nickelodeon 1998
After Dib is kidnapped by Zim, Gaz goes to save him in time for family dinner at her favorite restaurant.
11
Title-DoorToDoor
"Door to Door" March 29, 2002 Nickelodeon 1998
Zim utilizes virtual torture and destruction in order to sell candy bars for the school fund raiser.
Title-FBIWarningofDoom "FBI Warning of Doom" March 29, 2002 Nickelodeon 1998
Zim sees an FBI warning on a rented video and fears that his mission is threatened unless he returns the video immediately. At the mall, he faces the head of mall security.
12
Bolognius Maximus
"Bolognius Maximus" September 21, 2001 Nickelodeon 1998
Zim infects Dib with a virus that gradually turns him into meat. Dib manages to infect Zim with his own virus so they must work together to find the cure.
Title-Gameslave2 "Game Slave 2" September 21, 2001 Nickelodeon 1998
Gaz is on the trail of a video game fan who took the game console that was rightfully hers.
13
Title-BattleOfThePlanets
"Battle of the Planets" April 5, 2002 Nickelodeon 1998
Zim and Dib discover that two of the planets in the solar system are actually spacecraft created by alien civilizations, and use them to battle each other.
14
Title-HalloweenSpectacularOfSpookyDoom
"Halloween Spectacular of Spooky Doom" October 26, 2001 Nickelodeon 1998
As a result of experiments done by Dib, Zim and Dib are trapped in an alternate universe where the only escape is through Dib's head.
15
Title-MysteriousMysteries
"Mysterious Mysteries" March 22, 2002 Nickelodeon 1998
Dib goes on the TV show Mysterious Mysteries to tell the world the story of Zim. To Dib's surprise, Zim, GIR, and Gaz also appear on the show also to tell their sides of the story.
Title-FutureDib "Future Dib" March 22, 2002 Nickelodeon 1998
Zim uses a robot Dib to capture the real Dib while he attempts to destroy the earth.
16
Title-Hobo13
"Hobo 13" July 12, 2002 Nickelodeon 1998
Zim is sent to training planet Hobo 13 by The Tallest to take a series of tests and prove he is worthy of new equipment.
Title-WalkForYourLives "Walk for Your Lives" September 28, 2002 Nicktoons TV 2002
Zim causes a very slow explosion and must put it out before it destroys the city and his base.
17
Title-Megadoomer
"Megadoomer" April 26, 2002 Nickelodeon 1998
Zim is accidentally shipped a high-powered robot with a cloaking device and he immediately heads off to kill Dib with it.
Title-Lice "Lice" April 26, 2002 Nickelodeon 1998
A lice hunter comes to the school to investigate an outbreak of headlice. She soon discovers that the only one who is immune to the infestation is Zim.
18
Title-Abducted
"Abducted" April 12, 2002 Nickelodeon 1998
Zim and GIR are abducted by aliens as human and dog specimens. Escaping isn't difficult, as the aliens have only managed to stop one specimen from escaping in the past.
Sad Tale of Chickenfoot "The Sad, Sad Tale of Chickenfoot" April 12, 2002 Nickelodeon 1998
Dib sets out to disprove the legend of the Chickenfoot, who is actually a man stuck inside a chicken costume.
19
Title-GIRGoesCrazyAndStuff
"GIR Goes Crazy and Stuff" May 24, 2002 Nickelodeon 1998
Zim adjusts GIR's behavior but things go wrong when GIR sees Zim as a threat to their mission on Earth.
Title-DibsWonderfulLifeOfDoom "Dib's Wonderful Life of Doom" May 24, 2002 Nickelodeon 1998
Zim simulates Dib's entire life to find out whether or not he threw a muffin at Zim.
20
Title-TakTheHideousNewGirl
"Tak: The Hideous New Girl" May 10, 2002 Nickelodeon 1998
A pretty new girl, Tak, joins the class and is instantly beloved by all the other children. Zim thinks she's in love with him until she reveals that she's Irken and has come to destroy Earth to impress the Tallest and take his mission. Intended to be the season finale, it was aired out of order.
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