In Scooby Doo and the Witch's Ghost, Scooby and the gang are solving another mystery when they meet and befriend Ben Ravencroft, a famous horror writer. Velma is especially taken with Ravencroft.
The gang load up in the Mystery Machine and head to Ravencroft's home town in Salem Massachusetts. There, they find that a witch's ghost is taking her revenge on the town. The witch's ghost is none other than Ben Ravencroft's ancestor - Sarah Ravencroft.
Ben seeks to clear his ancestor's name and prove that she was a Wicken, who healed people, not an evil witch. Of course, the gang agrees to help him find Sarah's diary, so as to clear Sarah's name, and solve the mystery of the witch's ghost. There are lots of twists and turns in this Scooby Doo movie. We also are introduced to the Hex Girls, who appear in other Scooby Doo movies and television episodes.