City on the Edge of Forever (South Park)
"City on the Edge of Forever" (also known as "Flashbacks") is the seventh episode of the second season of the American animated television series South Park. The 20th episode of the series overall, it originally aired on Comedy Central in the United States on June 17, 1998. Series co-creator Trey Parker wrote the episode with writer Nancy M. Pimental. Parker also directed the episode. It guest stars Henry Winkler, Jay Leno, and Brent Musburger. In the episode, the boys reminisce about past experiences as their school bus is left hanging on the edge of a cliff. Ms. Crabtree leaves to look for help, but she forgets about the children when she meets a truck driver named Marcus.