The New Scooby-Doo Movies (1972)

S1E6 A Good Medium Is Rare

The group discovers a stray dog and brings her back to her owner, Phyllis Diller. However, they soon realize that Ms. Diller's home is believed to be haunted, allegedly by the spirits of her late husbands. As they investigate, they start to question whether it’s truly ghosts haunting her or if someone is attempting to frighten her into revealing the combination to her safe, which contains a valuable collection of jewels.