Don Messick as Scooby-Doo (voice) (archive footage)

Casey Kasem as Shaggy Rogers (voice) (archive footage)

Frank Welker as Fred Jones (voice) (archive footage)

Indira Stefanianna as Daphne Blake (voice) (archive footage)

Nicole Jaffe as Velma Dinkley (voice) (archive footage)

Marilyn Schreffler as (voice) (archive footage)

Michael Bell as (voice) (archive footage)

Vic Perrin as Additional Voices (voice) (archive footage) (archive footage)

Jean Vander Pyl as Additional Voices (voice) (archive footage)

Lennie Weinrib as Additional Voices (voice) (archive footage)

Hal Smith as Additional Voices (voice) (archive footage)

John Stephenson as Workers / Additional Voices (voice) (archive footage)