After being jailed for solving another mystery, the Mystery Inc. gang stumbles upon another mystery: a gruesome monster lurking underneath the town and cocooning everyone who comes near in green goop.
Quest roles:
Frank Welker(Scooby-Doo / Fred Jones (voice)), Grey Griffin(Daphne Blake (voice)), Casey Kasem(Colton Rogers (voice)), Lewis Black(Mr. E / Ricky Owens (voice)), Gary Cole(Mayor Fred Jones Sr. (voice)), Patrick Warburton(Sheriff Bronson Stone (voice)), Jeff Bennett(Dougal McGuiness (voice)), Frances Conroy(Angie Dinkley (voice)), Tony Cervone(Gary (voice)), Kath Soucie(Nan Blake (voice)), Fred Tatasciore(Gluten Demon (voice)), Dee Bradley Baker(Kriegstaffebot (Voice)), Vivica A. Fox(Cassidy Williams (voice)), Mitch Watson(Ethan (voice)), Kevin Dunn(Dale Dinkley (voice))