Halloween is sure to mean a mystery for Scooby-Doo and the kids from Mystery, Inc. And this year is bound to be the gang's spookiest Halloween yet. A weird Halloween mask is haunting the kids in Coolsville! Is it a ghost? Or is someone out to spoil the holiday for all the trick-or-treaters? It's up to Fred, Velma, Daphne, Shaggy, and Scooby-Doo to find out!