Cartman wakes up and realizes he was abducted by aliens after hearing it from his friends. He is in major denial at first though, but even Chef is a believer.
Cartman's dream about being abducted by aliens turns out to have actually happened, and when the aliens take Kyle's brother, all of them must find a way to bring the aliens back and confront them.
The living dead beset South Park after a bottle of Worcestershire sauce mixes with embalming fluid at the mortuary; Tina Yothers judged a costume contest.
The town is forced to remove anything that either has anything to do with Christmas or is offensive in the least bit to anyone. And Kyle tries to convince everyone of the existence of "Mr. Hankey, the Christmas Poo."