- Director: Audie Harrison
- Writer: Audie Harrison, Laura Pollak, Daniel McLellan, Daniel McLellan, Audie Harrison
- Producer: Joe Goyette, Audie Harrison, Sam Register
Mystery Inc. has cracked the case to top all cases. They've tracked down Coco Diablo, the head of a notorious costume crime syndicate. 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.