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)

Ted Knight

The Penguin / Troll (voice) (archive footage)