Casey Kasem as Shaggy Rogers (voice)

Don Messick as Scooby-Doo / Scrappy-Doo (voice)

B.J. Ward as Googie / Repulsa (voice)

Hamilton Camp as Dracula (voice)

Pat Musick as Vanna Pira (voice)

Rob Paulsen as Brunch (voice)

Frank Welker as Crunch (voice)

Jim Cummings as Frankenstein / Skull Head / Genghis Kong (voice)

Brian Stokes Mitchell as Bonejangles (voice)

Ed Gilbert as Dr. Jackyll / Mr. Snyde (voice)

Alan Oppenheimer as Mummy (voice)

Joan Gerber as Dreadonia Witch / Woman at Store (voice)

Mimi Seaton as Screamer (voice)

Sven Libaek as "The Werewolf Rock" Singer (uncredited voice)