The gang rescues two circus people who tell them that they have left a circus because it's bad luck. The ring master tells them of a mysterious person called 'The Ghost Clown' who is responsible for the many strange accidents and incidents in the circus.
Quest roles:
Casey Kasem(Shaggy Rogers (voice)), Don Messick(Scooby-Doo (voice)), Frank Welker(Fred Jones (voice)), Vic Perrin(Additional Voices (voice)), John Stephenson