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You can buy "Mostly Ghostly" on Apple TV, Amazon Video, Google Play Movies, YouTube as download or rent it on Apple TV, Amazon Video, Google Play Movies, YouTube online.
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Based on the successful book series by R.L. Stine, this spooky tale finds 11-year-old Max making a deal with the ghosts who haunt his home. If Max helps them find what was responsible for their parents' disappearance, they'll help him transform from a social nobody to the most popular kid in school.