Random Episodes
World War Zimmerman
This episode parodies the movie "World War Z".
In this South Park episode, Cartman is deeply disturbed by a person, which he considers to be a threat to all humanity (and it is not Kyle). 
City on the Edge of Forever (Flashbacks)
While their school bus is dangling on the edge of a cliff, the boys remember some of their past adventures. Mrs. Crabtree catches a ride into town with a stranger and winds up doing a brief stint as a... 
Goobacks
Humans from the year 4035 are arriving in droves in South Park! Everything gets a little too crowded when people from the future arrive through a recently discovered time portal. When the boys try to ... 