An alien race from the planet IRK plans a galaxy-wide invasion. The Almighty Tallests send out an Invader to live on a faraway planet along with a robot servant called "SIR" to study the planet's nature and inhabitants. One Invader, ZIM, who is overconfident and clumsy, is sent to Earth along with his robot, "GIR." On Earth, a boy named Dib Membrane lives with his busy scientist father and his sassy loner sister, Gaz. Dib is obsessed with proving that aliens exist and he has witnessed Zim's arrival.
