Invader Zim is an American animated television series created by Jhonen Vasquez. The show premiered on Nickelodeon on March 30, 2001. The series involves an extraterrestrial named Zim who originates from a planet called Irk, and his ongoing mission to conquer and destroy Earth. His various attempts to subjugate and destroy the human race are invariably undermined by some combination of his own ineptitude, his malfunctioning robot servant GIR, and a young paranormal investigator named Dib, one of the very few people attentive enough to be aware of Zim's identity. Invader Zim was targeted at children in their early teens, and met with critical acclaim, but after the first season, the show's ratings began to decline. Before the second season was completed, Nickelodeon cancelled the series, leaving at least twenty-three episodes and a planned television movie series finale unfinished. The show has maintained a cult following since the series' cancellation with a pilot, forty-six aired episodes, and about seventeen episodes that were in production around the time the series was cancelled. On August 19, 2006, all forty-six episodes have aired on television. Nineteen of the episodes are split into two individual stories, each lasting about twelve minutes. There are eight double-length episodes. All of the episodes were directed by Steve Ressel except for the pilot which was directed by Jordan Reichek.
The Invaders, alien beings from a dying planet. Their destination: the Earth. Their purpose: to make it their world. David Vincent has seen them, for him it began one lost night on a lonely country road, looking for a shortcut that he never found. It began with a closed deserted diner, and a man too long without sleep to continue his journey. It began with the landing of a craft from another galaxy. Now, David Vincent knows that the Invaders are here, that they have taken human form. Somehow he must convince a disbelieving world that the nightmare has already begun.
Squid Girl has come to the land from the depths of the sea to conquer humanity in revenge for pollution of the ocean. Unfortunately she ruins the first house she uses as an invasion base and has to work to pay for repairs. Of course, she can't overcome the Aizawa sisters who manage the house, so who knows whether she can subjugate humankind.
Kōtarō Satomi decided to live on his own when he began high school, and chose Room 106 of Corona House because it was cheap. Unfortunately, Kōtarō soon discovers that numerous otherworldly and supernatural girls also want his room for various reasons of their own, and aren't about to back down. As a result, Kōtarō and the girls find themselves forced to live together as they try to settle just who ends up with the room.
Two police officers investigate a series of brutal murders in which the victims have had bodily organs removed. When one of them questions a young woman who has been seen at the crime scenes, it turns out she is an alien from an interstellar prison ship and that the murders have been committed by a powerful xenomorphic alien which had escaped.