The New Scooby-Doo Movies: The Complete Collection
Guess Who's Knott Coming to Dinner!
S1 E4:
When the hopelessly lost members of Mystery, Inc. enter Moody Manor to ask for directions, Don Knotts, the world's greatest detective, mistakenly believes that they are the relatives of the estate's wealthy late owner. Don suspects that one of them murdered Captain Moody!