Scooby-Doo Meets The Addams Family (1972)

With the Mystery Machine stuck in mud, Mystery Inc. ends up becoming housekeepers for the Addams Family while Gomez and Morticia go on vacation to the Okefenokee Swamp. A giant vulture like super villain known as the Vulture threatens the Addams house and Wednesday goes missing, so Scooby and the gang go to find her and stop the Vulture.