The Mixed Up Mystery of Deadman's Reef While at the beach with some friends, Captain Caveman and the Teen Angels see a ship mysteriously vanish. Details Casts Title The Mixed Up Mystery of Deadman's Reef Genres Animation Comedy Kids Family Mystery Release Date 1977-09-17 Episode Runtime 00 Hours 30 Minutes Season Number 1 Episode Number 7 Production Companies Hanna-Barbera Productions Don Messick Announcer / Boo Boo Bear? Daws Butler Snagglepuss / Yogi Bear ? John Stephenson Mildew Wolf / Dread Baro? Casey Kasem Shaggy Rogers (voice) Scatman Crothers Hong Kong Phooey (voice) Frank Welker Dynomutt / Jabberjaw / M? Mel Blanc Barney Rubble / Captain ? Julie Bennett Cindy Bear (voice) Marilyn Schreffler Brenda Chance / Daisy Ma? Vernee Watson-Johnson Dee Dee Skyes (voice) Laurel Page Heather North (voices) Alan Reed Gary Owens Bob Holt Joe Besser Doug Young Julie McWhirter Ashley Johnson