Casey Kasem
Shaggy Rogers / Mirror Monster (voice)
Don Messick
Scooby-Doo / Scrappy-Doo (voice)
Glynis Johns
Ms. Grimwood (voice)
Susan Blu
Sibella Dracula (voice)
Patty Maloney
Tanis the Mummy (voice)
Pat Musick
Elsa Frankensteen (voice)
Marilyn Schreffler
Winnie Werewolf (voice)
Russi Taylor
Phantasma (voice)
Frank Welker
Matches / Papa Werewolf / Well Dweller (voice)
Andre Stojka
The Grim Creeper / Mummy Daddy (voice)
Zale Kessler
Daddy Dracula / Frankenstein Senior (voice)
Hamilton Camp
Phantom Father (voice)
Ruta Lee
Revolta (voice)
Ronnie Schell
Colonel Calloway (voice)
Scott Menville
Cadet Tug Roper (voice)
Aaron Lohr
Cadet Miguel (voice)
Bumper Robinson
Cadet Jamaal (voice)
Remy Auberjonois
Cadet Baxter (voice)
Jeff Cohen
Cadet Grunt (voice)
Brian Cummings
Fan Monster (uncredited voice)
Linda Gary
Doorbell Monster (uncredited voice)