When The Hex Girls are menaced by a phantom, Daphne poses as a member of the band. Meanwhile, Fred realizes he has feelings for Daphne and Scooby finds a new best friend.
Scooby-Doo and the Mystery Gang visit Oakhaven, Massachusetts to seek strange goings on involving a famous horror novelist and his ancestor who is rumored be a witch.
Hex Girl Thorn plays the cursed guitar of Ester Moonkiller during their concert. But when the ghost of Moonkiller appears on stage and curses everyone, Thorn and Luna's personalities transform into ordinary girls. The gang has to prevent the splitting of the band.