Created by Jhonen Vasquez for Nickelodeon , Invader Zim follows the chaotic misadventures of , an exiled alien from the planet Irk who is convinced he is on a "secret mission" to conquer Earth. Accompanied by his hyperactive, glitchy robot sidekick GIR —who often disguises himself in a green dog suit—Zim attempts to blend into human society while his nemesis, the paranormal-obsessed Dib , tries to expose his true identity. The show is famous for its dark humor, unsettling character designs, and angular, high-contrast animation style. Iconic Quotes