The Hex Girls (consists of Thorne, Dusk, and Luna), Velma's favorite band, come to Crystal Cove and plan to give the gang a concert. But things go awry when The Phantom, an evil specter, suddenly appears with the intention of permanently taking The Hex Girls out of the music business.

A deceased ska band returns from the grave and hypnotizes partygoers at the local nightclub to dance to their music. The gang is called to solve the mystery before they dance themselves to death.