Rent South Park: Vol.1 (1997)

Cartman Gets an Anal Probe
When aliens arrive in South Park, flaming flatulence and cattle mutilations are just part of the chaos that ensues.
Volcano
An active volcano and a mysterious creature named Scuzzlebutt threaten the boys' hunting and fishing weekend with Uncle Jimbo and Ned.
Weight Gain 4000
Cartman bulks up for a TV appearance with a famous talk-show hostess, while Mr. Garrison and Mr. Hat plot revenge for a childhood humiliation.
Big Gay Al's Big Gay Boat Ride
When Stan learns that his dog Sparky is gay, he loses the will to play in the big homecoming football game, until Big Gay Al comes to the rescue.