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You can buy "Happy Halloween, Scooby-Doo!" on Apple TV, Amazon Video, Google Play Movies, YouTube, Vudu, Microsoft Store as download or rent it on Apple TV, Amazon Video, Google Play Movies, YouTube, Vudu, Microsoft Store, Spectrum On Demand online.
Scooby-Doo and the gang team up with their pals, Bill Nye The Science Guy and Elvira Mistress of the Dark, to solve this mystery of gigantic proportions and save Crystal Cove!