Ghost of Dr. Coffin

On vacation in Niagra Falls, the gang ends up at a mental asylum haunted by a former doctor, Dr. Coffin. When the kids notice ambulances coming and going with no patients, they decide to find out what they are really carrying. He also has a hard to see cameo in Scooby-Doo 2: Monsters Unleashed as one of the costumes in the Coolsonian Criminology Museum.

Season One
(The Harum-Scarum Sanitarium)

Appearances

 * The Scooby-Doo Show - The Harum-Scarum Sanitarium
 * Scooby-Doo 2: Monsters Unleashed (cameo)