Be Cool, Scooby-Doo!

Ghost in the Mystery Machine (2x18)

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When the gang returns to Velasco, where they had previously solved a mystery, they discover there is yet another mystery in the town. The five friends have to solve their most difficult mystery yet when an evil force possesses the Mystery Machine and tries to hunt the gang down. While the gang flees for their lives, Fred goes through intense denial about his beloved van.