Siam

Don Messick

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

Daws Butler

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

John Stephenson

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

Casey Kasem

Shaggy Rogers (voice)

Scatman Crothers

Hong Kong Phooey (voice)

Frank Welker

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

Mel Blanc

Barney Rubble / Captain Caveman / Speed Buggy (voice)

Julie Bennett

Cindy Bear (voice)

Marilyn Schreffler

Brenda Chance / Daisy Mayhem (voice)

Vernee Watson

Dee Dee Skyes (voice)

Laurel Page

Heather North

(voices)