Invader Zim

Invader Zim is an American television sitcom that aired on Nickelodeon from March 31, 2001 to April 24, 2004. The series had a total of 60 episodes.

Plot
The series centers on Zim (voiced by Richard Steven Horvitz), a member of the imperialistic Irken race, an extraterrestrial species whose social hierarchy is based on height, rather than any type of skill. The Irken leaders, known as The Almighty Tallest(Wally Wingert and Kevin McDonald), rule the Irken Empire together because they are exactly the same height. As recounted during the series premiere, "The Nightmare Begins," Zim, who is both very short and very naive, was banished to the planet Foodcourtia for absentmindedly attacking his own planet and allies during Operation Impending Doom I.

Cast
Supporting characters include Dib's cynical sister Gaz (Melissa Fahn); Zim and Dib's teacher Ms. Bitters (Lucille Bliss); and Dib's father Professor Membrane (Rodger Bumpass). Later in the series, villains begin to appear, including Tak (Olivia d'Abo), a fellow Irken seeking revenge against Zim; Lard Nar (Fred Tatasciore), the leader of a resistance group called The Resisty who wants to overthrow the Irken Empire; and Sizz-Lorr (Jim Wise), Zim's former employer on Foodcourtia who attempts to recapture his employee.