Aliens land in South Park and kidnap Kyle's little brother.

Cartman wins the school's essay contest, and a celebrity comes to town.

The boys' hunting trip is threatened by activity from a nearby volcano and a mysterious creature.

Stan's dog explores his sexuality.

A genetic engineering experiment unleashes Stan's mutant twin.

With the help of Stan's grandfather, the kids summon the Grim Reaper.

Trick or treat in South Park is interrupted by an outbreak of "Pink Eye."