An alien named Zim from the planet Irk is sent on a secret mission to conquer Earth, not realising that his leaders were just trying to get rid of him and hoped that he would die. Once there, Zim manages to disguise himself as a human child, but one boy named Dib sees through his disguise.
The show's sense of humor is somehow dark without being bleak; even when the show takes its cues from horror movies - it's often quite scary - it's somehow never too much.
The strange and fantastical spaceships and technology that creator Jhonen invented for his world, along with a hint at the show's humor and art style, all of which help demonstrate what made Invader Zim the cult cartoon hit it still is today.
