The New Scooby-Doo Movies

The Haunted Horseman of Hagglethorn Hall (1x13)

Air date: Dec 02, 1972

A phantom knight is haunting Scottish Hagglethorn Castle, the ancestral home of famed musician, Davy Jones, which has been relocated to the United States. His uncle believes he has no choice but to hand it over to his cousin, the Duke of Strathmore, but Mystery Inc. is looking to solve the mystery.