Stan's aunt Flo gives him a goldfish, but Stan isn't so sure this is a good gift. When no one is looking, the fish jumps out and pulls Kenny into the fish bowl, devouring him. Stan and friends go to a strange pet store to ask about the fish, and the owner tells them about a portal that leads to a parallel world. The boys go through and evil versions of them come back to deal with the other strange animals that are causing havoc through the town.

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