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)