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