Scooby-Doo, Fred, Velma, Daphne, and Shaggy are all trapped in a spooky castle surrounded by ghosts, witches, and mummies with no way out.Scooby-Doo, Fred, Velma, Daphne, and Shaggy are all trapped in a spooky castle surrounded by ghosts, witches, and mummies with no way out.