Scooby's All-Star Laff-A-Lympics premiered September 10, 1977. The show features over 45 favorites of Hanna-Barbera's line-up on three teams, competing against one another. They are the Really Rottens, the Scooby Doobys, and the Yogi Yahooeys. The announcers of the games are Snagglepuss and Mildew Wolf. The Really Rottens cheated in all of the events to try and win the games. Very rarely did their dastardly deeds succeed. Sometimes there are special guest referees for the events.

Voice Cast:
Annouoncers:
Snagglepuss ................................................. Daws Butler
Mildew Wolf ................................................. John Stephenson

The Scooby-Doobys:
Scooby-Doo .................................................. Don Messick 
Scooby-Dum .................................................. Daws Butler
Shaggy ...................................................... Casey Kasem
Hong Kong Phooey ............................................ Scatman Crothers
Jeannie ..................................................... Julie McWhirter
Babu ........................................................ Joe Besser
Dynomutt/Tinker ............................................. Frank Welker
Blue Falcon ................................................. Gary Owens
Captain Caveman/Speed Buggy ................................. Mel Blanc
Branda Chance ............................................... Marilyn Schreffler
Dee Dee Sykes ............................................... Vernee Watson
Taffy Dare .................................................. Laurel Page

The Yogi Yahooeys:
Yogi Bear/Huckleberry Hound/Hokey Wolf/Snooper/Blabber ...... Daws Butler
Wally Gator/Quick Draw McGraw/Auggie Doggie/Dixie/Jinks ..... Daws Butler
Doggie Daddy ................................................ John Stephenson
Boo Boo/Pixie ............................................... Don Messick
Grape Ape ................................................... Bob Holt
Yakky Doodle ................................................ Frank Welker
Cindy Bear .................................................. Julie Bennett

The Really Rottens:
Mumbly/Dastardly Dalton/Mr. Creepley ........................ Don Messick
Daisy Mayhem ................................................ Marilyn Schreffler
Sooey Pig/Magic Rabbit ...................................... Frank Welker
Dread Baron/The Great Fondoo ................................ John Stephenson
Orful Octopus/Dinky Dalton .................................. Bob Holt
Dirty Dalton ................................................ Daws Butler
Mrs. Creepley ............................................... Laurel Page