The Scooby-Doo/Dynomutt Hour

Season 1, Episode 13

Episode Title: The Harum Scarum Sanitarium

Air Date: 1976-10-23

Overview:

Going to Niagara Falls the gang ends up staying at an asylum being haunted by the ghost of Dr. Coffin. His two henchmen seem to be driving an ambulance taking patients, but are they really patients or are they hiding something?