Watch Free Online HD Moviesjoy. Celebrate the season Scooby-Doo style as Scooby-Doo and the Mystery, Inc. gang face off festive frights, frosty nights and - jeepers - the ghost of Christmas, who wants to wish everyone a scary Christmas! In this collection of cold-weather capers, Scooby-Doo and the gang unwrap a series of mysteries in order to stop a group of chilling crooks from stealing the spirits of the season!