While on a road trip, Captain Caveman and the Teen Angels are given a mysterious key by a stranger.

Don Messick
Announcer / Boo Boo Bear / Scooby-Doo / Mr. Creeply (voice)

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Daws Butler
Snagglepuss / Yogi Bear / Quick Draw McGraw / Various (voice)

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John Stephenson
Mildew Wolf / Dread Baron / Great Fondoo / Doggie Daddy (voice)

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Casey Kasem
Shaggy Rogers (voice)

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Scatman Crothers
Hong Kong Phooey (voice)

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Frank Welker
Dynomutt / Jabberjaw / Magic Rabbit / Sooey Pig (voice)

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Mel Blanc
Barney Rubble / Captain Caveman / Speed Buggy (voice)

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Julie Bennett
Cindy Bear (voice)

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Marilyn Schreffler
Brenda Chance / Daisy Mayhem (voice)

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Vernee Watson-Johnson
Dee Dee Skyes (voice)

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Laurel Page

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Heather North
(voices)

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Alan Reed

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Gary Owens

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Bob Holt

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Joe Besser

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Doug Young

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Julie McWhirter

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Ashley Johnson

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