Scooby-Doo! and the Reluctant Werewolf (1988)
Scooby-Doo and the Reluctant Werewolf is a 1988 animated comedy horror movie for television produced by Hanna-Barbera. It was the last to air as part of the Superstars 10 series. It also marks Scrappy-Doo's last appearance until 2002's Scooby Doo live-action feature film.
More at Wikipedia.