The New Scooby-Doo Movies (1972)

S01E03 Wednesday is Missing

Title: Where's Wednesday? Plot: After their van breaks down, the Mystery Inc. crew stops by the eerie abode of the Addams Family for help. However, Gomez and Morticia mistakenly believe they are the new staff and enlist them to manage their quirky household. Meanwhile, the gang embarks on a search for the elusive Wednesday. As they investigate, they must determine whether she's been kidnapped or if the strange happenings in the Addams house are simply supernatural occurrences.