Nicole Jaffe

Velma Dinkley (voice) (archive footage)

Casey Kasem

Norville 'Shaggy' Rogers / Robin (voice) (archive footage)

Don Messick

Scooby-Doo / Professor Flakey (voice) (archive footage)

Heather North

Daphne Blake (voice) (archive footage)

Frank Welker

Fred Jones (voice) (archive footage)

Olan Soule

Batman (voice) (archive footage)

Larry Storch

The Joker (voice)

Ted Knight

The Penguin / Troll (voice) (archive footage)