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Watch Happy Halloween, Scooby-Doo! (2020) online for free on 123Movies. 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!
Original title Happy Halloween, Scooby-Doo!
IMDb Rating 6.8 158 votes
TMDb Rating 8.2 5 votes