Scooby-Doo, Where Are You! - Season 1 Episode 7 -

Scooby-Doo and his friends are visiting the set of a movie that Daphne's uncle is directing. When odd things start occurring, the gang learn that there's a local legend of an ape man that supposedly haunts the area and what's happening now appears to be his handiwork. Offering to help get to the bottom of the mystery, Daphne's uncle reluctantly gives them jobs as extras to find out what's going on.