Invader Zim episodes to watch online for free
Funny cartoon about an alien who is trying to take over the world. You gotta watch it if you haven't before, this show is hilarious and entertaining. This series has long been canceled, but it's still no doubt one of the funniest and best shows that ever aired on television. This list is updated five times everyday, new episodes are uploaded and added daily until all the episodes are uploaded and listed.
The Nightmare Begins - The first episode of Invader Zim
Parent-Teacher Night - Invader Zim brings his parents to the parent-teacher night meeting at his school.
Walk of Doom - Zim takes Gir around town after installing a new systems guidance chip.
Bestest Friend - Invader Zim makes his first friend in school.
NanoZim - Zim shrinks down to the size of a pebble and infiltrates Dib's body.
Germs - Zim buys a new pair of goggles that enable him to see the germs. Panicked by how many there are, he arranges to rid the world of all germs.
Dark Harvest - Zim realizes that he is missing vital parts of the human body, organs! Zim starts stealing organs and other body parts from other students at his school and attaching them to his own body, transforming himself into a huge, dark blob.
Attack of the Saucer Morons - After crash landing into a park at night, Zim decides to abandon his ship and pick it up the next day when he's ready. However, when he returns to the site in the morning, he finds hundreds of people gathered around his spaceship.
The Wettening - Dib and Zim have a balloon fight that will decide the fate of humanity.
Career Day - It's career day for Dib and he gets paired up with a real paranormal investigator. Bad news for Zim, his secret is about to be revealed!
Battle Dib - Dib endures many challenges just to gain access to his own father to sign his permission slip. Gaz is several steps ahead of her brother at every turn. This is one of three episodes where Zim doesn’t appear.
A Room with a Moose - Zim sends his classmates on a bizarre field trip on a hijacked school bus.
Hamstergeddon - Zim turns the class hamster into a giant monster, but has to team up with Dib when it attacks his base.
Invasion of the idiot dog brain - GIR’s brain takes over the base’s operating system and uses the it to go to a fast-food Mexican restaurant drive-thru.
Bad, bad rubber piggy - Zim sends several rubber piggies into the past to stop Dib from tampering with the present, but it backfires.
Planet Jackers - Zim battles two planet hijackers who want to use the earth as fuel for their dying sun.
Rise of the Zitboy - Zim uses his giant hypnotic pimple to get Dib to tell him the weakness in his base’s security.
Plague of Babies - Zim discovers a squad of aliens living on earth who look like human babies. They were stranded years ago and try to steal Zim’s ship to return to their home planet.
Bloaty's Pizza Hog - Gaz saves Dib after Zim kidnaps him so they can go on their annual family dinner with dad at Bloaty’s Pizza.
Bolognius Maximus - Zim infects Dib with a virus that slowly turns him into a log of bologna, but Dib fights back by infecting Zim with the same virus. They end up working together to find a cure.
Game Slave 2 - In another of the the three episodes where Zim doesn’t appear, Gaz stalks another gamer who took the last Game Slave 2 game that was rightfully hers.
Halloween Spectacular of Doom - As a result of Dib’s experiments, Zim and Dib are trapped in an alternate universe where the only exit is through Dib’s head.
Mysterious Mysteries - Dib goes on the Mysterious Mysteries TV Show to tell the world about Zim. To his surprise, Gaz, GIR and Zim also appear to tell their sides of the story.
Future Dib - Zim captures Dib with a Dib robot replicant while he tries to destroy earth.
Door to Door - Zim’s class sells candy bars for the school fund raiser.
FBI Warning of Doom - Zim receives a threatening phone call from the video store to return an overdue video when he sees the FBI warning as GIR replays it. Fearing his mission is in jeopardy if the video isn’t returned immediately, Zim battles mall security to return it after business hours.
Battle of the Planets - 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.
Abducted - Zim and GIR are abducted by idiotic aliens as human and dog specimens, but escape easily.
The sad, sad tale of Chickenfoot - The last of three episodes where Zim doesn’t appear, Dib sets out to disprove the legend of Chickenfoot, who is really a man stuck in a chicken costume by a defective zipper.
Megadoomer - Zim is accidently shipped a super robot with a cloaking device and uses it to try to kill Dib.
Lice - An outbreak of headlice sends a lice hunter to the school to investigate. She discovers the only ones not infested with lice are Zim and Ms. Bitters.
Tak the Hideous New Girl - This episode was aired out of order (as many were) and was meant to be the season finale. Tak, the pretty new girl, joins the class and is instantly beloved by the other children. Zim thinks she is in love with him until she reveals she is Irken and has come to destroy Earth, take Zim’s mission and impress the Tallest.
Gir Goes Crazy and Stuff - Zim tries adjusting GIR’s behavior, but things go wrong when GIR sees Zim himself as a threat to the success of their mission on Earth.
Dib's Wonderful Life of Doom - Someone throws a muffin at Zim, so Zim simulates Dib’s entire life to find out if Dib threw it.
Hobo 13 - The Tallest send Zim to the training planet Hobo 13 where he must succeed at a number of extremely difficult tests to prove his is worthy of new equipment. There are wagers going wild all over the Irken Empire as to Zim’s outcome of the challenges.
Walk For Your Lives - Originally meant to air next to the Hobo 13 episode, Zim causes an extremely slow explosion that he must put out before it destroys the city and his base.
The Most Horrible X-Mas Ever - Zim discovers how much people like Santa Claus and decides to use this in a plan to take over the world by dressing up in a Santa suit full of data about Christmas.
The Frycook What Came All That Way from Space - While in school, a mysterious figure kidnaps Zim and takes him into space.
Gaz Taster of Pork - Dib discovers that his electronic spell drives still have two credits on them, which allow him to cast spells. Not knowing what the spells would do, he casts one on his sister Gaz instead to see what would happen.
The Voting of the Doomed - Zim decides to use the school's election to gain power, so Dib becomes the manager of his opponent to try and stop him.
Backseat Drivers from Beyond the Stars - Zim desires to bring his masters to Earth to witness his next plan for world domination involving a brain parasite, so he remotely takes control of the "Massive".
Mortos Der Soulstealer - Dib summons a mystical beast called Mortos Der Soulstealer to attack Zim and prevent him from taking over the world. Mortos will grant Dib anything he wants, but is tired and requests time and food to regenerate.
Zim Eats Waffles - Dib has managed to get a spy camera into Zim's base in the hopes of recording some evidence that will prove he's an alien.
The Girl Who Cried Gnome - A girl selling cookies gets her foot trapped in Zim's front yard and it attracts the attention of the neighbors, press and the Earth president.
Vindicated - Dib sees the school's counselor, Mr. Dwicky, about his problems at school, and Dib tells him about how Zim's an alien trying to take over the Earth.
Dibship Rising - Dib is again working on Tak's crashed spaceship, which turned on him the last time he activated it because its computer AI is a digital copy of Tak's mind.