Scooby-Doo Meets the Boo Brothers (1987) (TV)

Director: Paul Sommer, Carl Urbano
Cast: Casey Kasem, Don Messick, Jerry Houser, Rob Paulsen, Ronnie Schell, Sorrell Booke

Synopsis:

When Shaggy inherits an old Southern estate from an uncle, he and his sleuthing hounds take a road trip. But they don’t even make it to the mansion before the haunting starts. Amid headless horsemen, walking skeletons, and a menacing butler, Scooby, Scrappy, and Shaggy get majorly spooked.