A Clue for Scooby-Doo While Scooby-Doo is surfing, he encounters a creature in a diving suit. An old sea salt tells the gang that it's the ghost of Captain Cutler who is responsible for the disappearance of many ships. Details Casts Title A Clue for Scooby-Doo Genres Animation Mystery Comedy Kids Family Release Date 1969-09-20 Episode Runtime 00 Hours 22 Minutes Season Number 1 Episode Number 2 Production Companies Hanna-Barbera Productions Casey Kasem Shaggy Rogers (voice) Nicole Jaffe Velma Dinkley (voice) Don Messick Scooby-Doo (voice) Frank Welker Fred Jones (voice) Indira Stefanianna Daphne Blake (voice)