Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Invader Zim, branded as Invader ZIM, is an American animated television series that was produced by and subsequently aired on Nickelodeon. The series is centered on an alien invader named Zim from the planet Irk who is attempting to conquer or destroy a dark and satirical future version of the Earth. Zim's schemes are usually foiled by his mistakes, his hyperactive robot GIR, or by his arch-nemesis Dib, a paranormal enthusiast who goes to school with Zim and is one of the few characters aware of Zim's true identity. The show makes heavy use of black comedy. At the time, Nickelodeon had wanted to air a show for its eleven to fifteen year-old demographic when Invader Zim was first broadcast on March 30, 2001. Nickelodeon promoted Invader Zim for this purpose, and met critical acclaim. However, the show suffered in the ratings after an initially lukewarm viewership. Before the second season was completed, Nickelodeon canceled the show, citing low ratings, over-budget production, and lack of interest in continuation of the series, leaving at least sixteen episodes and a planned television movie series finale unfinished.