The Reverse Clock is the unofficial name of the magical grandfather clock that Father Time owns in both the comic books and the cartoon show, which first appeared in the cartoon show episode "The Smurflings". It is a clock that reverses the aging of whoever enters into it, as the three Smurfs named Nat, Snappy, and Slouchy found out when they accidentally entered into it. It is so named because the hands of the clock are constantly going in reverse. According to Father Time, those that are age-reversed by that clock cannot simply be magically restored to their proper ages, so they must go through the aging process again.