South Park

Season 2, Episode 7 — City on the Edge of Forever (Flashbacks)

TMDB episode metadata

Show: South Park

Episode title: City on the Edge of Forever (Flashbacks)

Air date: June 17, 1998

Director: Trey Parker

Top billed cast: Trey Parker, Matt Stone, Isaac Hayes, Mary Kay Bergman, Mona Marshall, Jennifer Howell

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 standup comedienne. Back in South Park, Mr. Mackey convinces the parents that their missing children must have run away. In the end it's all a dream within a dream.

Source: TMDB