Shaggy Rogers / Mirror Monster (voice)

Casey Kasem

Acting

Scooby-Doo / Scrappy-Doo (voice)

Don Messick

Acting

Ms. Grimwood (voice)

Glynis Johns

Acting

Sibella Dracula (voice)

Susan Blu

Acting

Tanis the Mummy (voice)

Patty Maloney

Acting

Elsa Frankensteen (voice)

Pat Musick

Acting

Winnie Werewolf (voice)

Marilyn Schreffler

Acting

Phantasma (voice)

Russi Taylor

Acting

Matches / Papa Werewolf / Well Dweller (voice)

Frank Welker

Acting

The Grim Creeper / Mummy Daddy (voice)

Andre Stojka

Acting

Daddy Dracula / Frankenstein Senior (voice)

Zale Kessler

Acting

Phantom Father (voice)

Hamilton Camp

Acting

Revolta (voice)

Ruta Lee

Acting

Colonel Calloway (voice)

Ronnie Schell

Acting

Cadet Tug Roper (voice)

Scott Menville

Acting

Cadet Miguel (voice)

Aaron Lohr

Acting

Cadet Jamaal (voice)

Bumper Robinson

Acting

Cadet Baxter (voice)

Remy Auberjonois

Acting

Cadet Grunt (voice)

Jeff Cohen

Acting

Fan Monster (uncredited voice)

Brian Cummings

Acting

Doorbell Monster (uncredited voice)

Linda Gary

Acting