Soon after a confrontation with the Dib human, an accident on Zim's space base causes it to go through a wormhole leading to an unfamiliar world. At first, Zim just wants to return to his base, but he changes his mind upon thinking about conquering Equestria after dealing with Earth. He manipulates the strange horse beasts to teach him about their pitiful lives so that he'll be prepared for when that time comes.

One of these creatures finds out about his intentions and teams up with Dib. They are dead set on revealing what Zim's true intentions are to the citizens of Ponyville. For whatever reason, Dib and his new minion both have something against the Twilight Sparkle unicorn.