ZIM

Invader Zim is the villain of the cartoon on Nickelodeon.

Origin
Zim is an alien from Planet Irk who was not well-respected, due to his small stature. He lost all trust from his fellow invaders when he botched an invasion mission, and wound up destroying a part of Irk. Hoping to get rid of him, his superiors sent him away to a secluded area of space on a fake invasion mission, hoping he would never find his way back. Unfortunately, Zim found Earth and thought it was his mission to conquer it.

Goals and Ambitions
Zim wants nothing more than to take over Earth, and impress his superiors.