Zim is a member of the mighty Irken race, a species of alien life forms whose social hierarchy is based on height. The Irken leaders are the Almighty Tallest (during the course of the show, leadership of the Irken Empire is shared by two Tallest, Purple and Red, who are exactly the same height). Zim was banished to the planet Foodcourtia for killing all the other Invaders during Operation Impending Doom I.

Upon hearing of Operation Impending Doom II, Zim "quits" being banished and arrives at the Great Assigning where Irken soldiers are chosen to become Invaders, special soldiers whose mission it is to blend in with the indigenous life forms of their assigned planet and collect intelligence. Zim pleads with the Tallest to assign him a planet, and in a desperate act to get Zim as far away as possible, they assign him to a "Mystery Planet" on the outskirts of their known universe, which turns out to be Earth.

The show features Zim trying to conquer the Earth while his human arch-nemesis Dib tries to stop him. Technically, the show takes place in a world of its own, with a present-day Earth more technologically advanced than ours. Because the alternate universe aspect was never emphasized, the result is that the series appears to be set at some point in the near future

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