Invader Zim is an American animated science fiction dark comedy television series created by comic book writer and cartoonist Jhonen Vasquez for Nickelodeon. The series centers on an extraterrestrial named Zim (voiced by Richard Steven Horvitz), from the planet Irk, and his mission is to conquer Earth and enslave the human race along with his malfunctioning robot servant GIR (Rosearik Rikki Simons). He is antagonized by Dib (Andy Berman), a young paranormal investigator who is determined to stop Zim from succeeding.
The series centers on Zim, a member of the extraterrestrial Irken species and the Irken Empire from the planet Irk. The empire's goal is universal conquest and has a social hierarchy based solely on physical height. The empire's leader is called The Almighty Tallest; at the beginning of the series the position is jointly held by two equally tall individuals. Zim is an outcast; he is delusional, very short, overzealous, narcissistic, and megalomaniacal.