Invader Zim is created by Jhonen Vasquez. Zim is an outcast of the Irken race. He was banished to a planet called 'Foodcourtia' because he almost destroyed his home planet after Operation Impending Doom 1. He 'quit' his banishment after he heard about Operation Impending Doom 2. Zim shows up at the great assigning. He begs them to let him become an Invader once again, but the Tallest give him a sandwich to try to get him to go away. After being fed up with him, they send him to conquer a planet that they don't know exist. That planet is Earth. The Tallest start to assign everyone their SIR units. To further make fun of Zim, they make a unit for him out of spare SIR parts. Of course, this robot is very stupid and they tell him it's 'advanced'. They call it a GIR unit, and when Zim asks what the 'G' stands for, GIR starts up and says it doesn't know and then starts bounching around all over the place. They then set off for their mission.

Of course, there has to be something stopping Zim from taking over the world. This someone is Dib. No one believes him when he says that Zim is an alien. They instead call him crazy and insane. Dib trys to spoil all of Zim's plans, but never gets to expose him as the alien he is. His younger sister is Gaz, who is obsessed with video games and pizza.

To summarize this whole show, it's really amazing and if you don't like it, you're crazy...