Invader Zim

Official series
Invader Zim is an American animated television series created by comic book writer/artist Jhonen Vasquez for Nickelodeon. First broadcast on March 30, 2001, the same day as The Fairly OddParents, Nickelodeon desired a show aimed at their older viewers. Unfortunately, the show never found a time slot that the creators of the program thought suitable and suffered in the ratings. The show crew requested that Invader Zim be moved to MTV in a similar way Ren and Stimpy had been, but this never happened, and the show was cancelled during production of its second season. The series has since been translated into several different languages for foreign broadcast (Nickelodeon Wiki)

Fan Series
Main article: Invader Zim: The Fanseries