When Scooby and the gang hear of a werewolf plaguing a traveling circus, they go undercover as circus performers to get to the bottom.
| Actor | Role |
|---|---|
 Frank WelkerScooby-Doo / Fred (voice) | Scooby-Doo / Fred (voice) |
 Mindy CohnVelma (voice) | Velma (voice) |
 Grey DeLisleDaphne (voice) | Daphne (voice) |
 Matthew LillardShaggy (voice) | Shaggy (voice) |
 Greg EllisMarcus Brancusi (voice) | Marcus Brancusi (voice) |
 Maurice LaMarcheArchambault (voice) | Archambault (voice) |
 Peter StormareWulfric von Rydingsvard (voice) | Wulfric von Rydingsvard (voice) |
 Jeff DunhamSchmatko / Conductor (voice) | Schmatko / Conductor (voice) |
 Carlos FerroOliverio / Sisko (voice) | Oliverio / Sisko (voice) |
 Jess HarnellHuman Scooby-Doo / Guard (voice) | Human Scooby-Doo / Guard (voice) |
 Jim MeskimenPhil Flaxman / Detective (voice) | Phil Flaxman / Detective (voice) |
 Candi MiloJean (voice) | Jean (voice) |
 Hynden WalchLena / Joan (voice) | Lena / Joan (voice) |
 Craig FergusonWhitney Doubleday (voice) | Whitney Doubleday (voice) |