the show is about an alien from the planet irk named zim. at the beginning of the series, irk had begun "operation impending doom II", a mission to conquer every planet in the universe. zim was an irken who wished to participate, and was reluctantly allowed to do so by the almighty tallest, the leaders of irk. zim has a robotic servant named GIR, and zim's archnemesis is dib, a boy who knows the identity of zim but is ridiculed by his peers.
2. A very small Irken invader, sent to Earth to wreak dooooom down upon the filthy heads of his doomed enemies.
"Shut your noise-tube taco human"-Zim in Invasion of the Idiot Dog Brain