"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.

Ms. Crabtree leaves to seek help, but forgets about the children when she meets a truck driver named Marcus, and pursues a career as a stand-up comedian.

The kids remain there and remember past experiences (featuring clips from previous episodes), although they usually end with everyone enjoying ice cream (as noted by new animated sequences).

An argument in which Kyle corrects Cartman's past experience causes the bus to go over the cliff; it lands in a gigantic tub of ice cream.

One of the children's flashbacks features Fonzie from Happy Days jumping over a series of garbage cans, referencing the Season 3 two-part episode "Fearless Fonzarelli".