Invader Zim, banished from his home planet, comes to Earth and sets up a base to start learning about its inhabitants, but Dib is on his tail.

ZIM befriends a weird kid named Keef who won't go away in order to prove his humanity. Dib and ZIM fight a war that uses Dib's organs as the battle field.

ZIM tries to prove that he's human and brings his Robo-parents to school, with disastrous results. ZIM and GIR become lost in the city.

ZIM wears special germ-seeing goggles and becomes obsessed with cleanliness. Convinced that a doctor's exam will show he's not human, ZIM harvests the children's organs and puts them in his own body.

ZIM must get away from a group of alien-worshipping weirdos. ZIM and Dib start a water fight to end all water fights.

Dib and ZIM spend the day with adult counterparts when they take career tests. Dib tries to get someone else to sign a permission slip.