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You can buy "Happy Halloween, Scooby-Doo!" on Apple TV, Microsoft Store, Amazon Video, Rakuten TV as download or rent it on Microsoft Store, Rakuten TV, Apple TV, Amazon Video 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!