Shaggy Rogers / Mirror Monster (voice)
Casey Kasem
Scooby-Doo / Scrappy-Doo (voice)
Don Messick
Daddy Dracula / Frankenstein Senior (voice)
Zale Kessler
Phantom Father (voice)
Hamilton Camp
Revolta (voice)
Ruta Lee
Colonel Calloway (voice)
Ronnie Schell
Cadet Tug Roper (voice)
Scott Menville
Cadet Miguel (voice)
Aaron Lohr
Cadet Jamaal (voice)
Bumper Robinson
Cadet Baxter (voice)
Remy Auberjonois
Cadet Grunt (voice)
Jeff Cohen
Fan Monster (uncredited voice)
Brian Cummings
Ms. Grimwood (voice)
Glynis Johns
Doorbell Monster (uncredited voice)
Linda Gary
Sibella Dracula (voice)
Susan Blu
Tanis the Mummy (voice)
Patty Maloney
Elsa Frankensteen (voice)
Pat Musick
Winnie Werewolf (voice)
Marilyn Schreffler
Phantasma (voice)
Russi Taylor
Matches / Papa Werewolf / Well Dweller (voice)
Frank Welker
The Grim Creeper / Mummy Daddy (voice)
Andre Stojka
Executive Producer
William Hanna
Animation Director
Ray Patterson
Casting
Andrea Romano
Joseph Barbera
Director
Charles A. Nichols
James T. Walker
Writer
Glenn Leopold
Producer
Bob Hathcock
Bernard Wolf
Original Music Composer
Sven Libaek
Editor
Gil Iverson