Season 2, Episode 15 - "Spooky Fish"
27 October, 1998
Aunt Flo is making her monthly visit and she has a present for Stan, a fish. The fish freaks Stan out, especially when the dead bodies start piling up. Sharon is convinced her son is responsible for the crimes and she starts hiding the bodies. When Cartman exhibits behavior that is very uncharacteristic for him, the boys discover there are two Cartmans (one good and the other evil) and the gateway to another dimension is found in the local pet store.
