Cartman is excited about his upcoming birthday party and lets everyone invited know what present he expects to receive from each. When they protest, he threatens to ban them from eating the food his mother makes, something that immediately convinces them. They encounter a new student named Damien, son of Satan. The other boys mock him and, in response, Damien turns Kenny into a duck-billed platypus. Damien informs Jesus that Satan will rise for a final battle with him of good versus evil. South Park residents immediately begin making bets on the fight. Cartman is angered to learn the event is scheduled for the same time as his party, and the children struggle to choose between the two events.