Zim finds that he is severely allergic to the school cafeteria's food, and Dib uses this fact to try to prove to the other children that Zim is an alien. Zim escapes and uses a listening device planted on the back of Dib's head to spy on Dib's house—Zim discovers that Dib intends to kill him with the cafeteria food. Zim and Dib stage an apocalyptic food fight in the school cafeteria, which ends with Zim escaping and Dib being blamed for the food fight.

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