 Stan s mother is getting a visit from her Aunt Flo, who gives Stan a pet fish as a present. Something doesn t seem right about the fish, though, and soon dead bodies start turning up in Stan s room. Though Stan tries to convince his mother that the fish did it, she assumes that her son is a murderer and begins hiding the bodies in the backyard. Meanwhile, Cartman starts acting strangely, sometimes wearing a goatee and acting unusually nice, other times looking and acting like his obnoxious self. Somehow, these events are all related.