Mystery Inc. has cracked the case to top all cases! They’ve tracked down Coco Diablo, the head of a notorious costume crime syndicate. With Coco and her kitty in prison, Mystery Inc. thinks that they can finally enjoy a break. Wrong! Suddenly, menacing doppelgänger ghosts of the Scooby crew and favorite classic foes show up in Coolsville to threaten Halloween. Now it’s up to the meddling kids to unmask the latest scoundrel and save Halloween!
Frank Welker
as Scooby-Doo / Rudy / Fred / Nefario (voice)
Grey DeLisle
as Daphne / Daisy / Musketeer 1 / Olive (voice)
Matthew Lillard
as Shaggy / Craggly / Captain Cutler (voice)
Kate Micucci
as Velma / Helga (voice)
Myrna Velasco
as Coco Diablo (voice)
Dee Bradley Baker
as Esteban / Mr. Wickles / Cat Man (voice)
Jeff Bennett
as Shady Guy / Charlie Humdrum / Hank (voice)
Anthony Carrigan
as Trevor Glume / Farmer (voice)
Erin Fitzgerald
as Library Kid / Superhero Girl / Musketeer 2 (voice)
David Lodge
as Warden Collins / Harry the Hypnotist / Inspector (voice)
Lara Jill Miller
as Prisoner Costume Teen / Superhero Boy / Musketeer 3 (voice)
Candi Milo
as Prison Woman / Dinosaur Kid / Monster Kid (voice)
