The New Scooby-Doo Movies is the second series of Scooby-Doo cartoons, and it ran on CBS from 1972 to 1974. Each episode is about an hour long and added well-known figures, either real or fictional, to help Mystery, Inc. solve the case.
The Secret Of Shark Island (S01E08)
The Haunted Showboat (S02E02)
The Haunted Carnival (S02E08)