Henry Corden
(voice)

Allan Melvin
Additional Voices (voice)

Casey Kasem
Shaggy Rogers / Additional Voices (voice)

Julie McWhirter
Additional Voices (voice)

Micky Dolenz
Supporting Voices / Additional Voices (voice)

Don Messick
Scooby-Doo / Additional Voices (voice)

Gary Owens
Blue Falcon (voice)

Virginia Gregg
Additional Voices (voice)

Larry McCormick
(voice)

Heather North
Daphne Blake (voice)

Patricia Stevens
Velma Dinkley (voice)

Bob Holt
Additional Voices (voice)

Daws Butler
Scooby-Dum / Additional Voices (voice)

Frank Welker
Fred Jones / Additional Voices / Dynomutt (voice)

Shirley Mitchell
Olivia / Additional Voices (voice)

Joan Gerber
Additional Voices (voice)

Ron Feinberg
Additional Voices (voice)

Ralph James

John Stephenson
Additional Voices (voice)

Regis Cordic
(voice)