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.
as Shaggy Rogers (voice)
as Scooby-Doo / Scrappy-Doo (voice)
as Googie / Repulsa (voice)
as Dracula (voice)
as Vanna Pira (voice)
as Brunch (voice)
as Crunch (voice)
as Frankenstein / Skull Head / Genghis Kong (voice)
as Bonejangles (voice)
as Dr. Jackyll / Mr. Snyde (voice)
as Mummy (voice)
as Dreadonia Witch / Woman at Store (voice)
as Screamer (voice)
as "The Werewolf Rock" Singer (uncredited voice)
