The Mystery Inc. gang has solved the ultimate case by uncovering Coco Diablo, the leader of a notorious costume crime syndicate. However, their celebration is short-lived as sinister ghostly duplicates of themselves and their arch-nemesis appear in Coolsville, threatening to ruin Halloween. The meddling kids must now unmask the mastermind behind the doppelgängers and save the holiday.
Trick or Treat Scooby-Doo!
After solving the mystery and capturing Coco and Kitty, the gang can finally take a well-deserved break.
