Shaggy is turned into a werewolf, and it's up to Scooby, Scrappy and Shaggy's girlfriend to help him win a race against other monsters, and become human again.
Shaggy Rogers (voice)
Casey Kasem
Scooby-Doo / Scrappy-Doo (voice)
Don Messick
Googie / Repulsa (voice)
B.J. Ward
Dracula (voice)
Hamilton Camp
Vanna Pira (voice)
Pat Musick
Brunch (voice)
Rob Paulsen
Crunch (voice)
Frank Welker
Frankenstein / Skull Head / Genghis Kong (voice)
Jim Cummings
Bonejangles (voice)
Brian Stokes Mitchell
Dr. Jackyll / Mr. Snyde (voice)
Ed Gilbert
Mummy (voice)
Alan Oppenheimer
Dreadonia Witch / Woman at Store (voice)
Joan Gerber
Screamer (voice)
Mimi Seaton
"The Werewolf Rock" Singer (uncredited voice)
Sven Libaek