Leo's (Brian Kruause) old mentor at Magic School, Gideon (guest star Gildart Jackson), calls upon Piper (Holly Marie Combs), Phoebe (Alyssa Milano) and Paige (Rose McGowan) to find out who cast the spell of darkness upon the school and conjured up the Headless Horseman, who has been beheading the teachers. Meanwhile, Phoebe is sent on a vision quest by Enola (guest star Elena Finney), a young shaman student, and gets a glimpse into the future, where she discovers Chris' (Drew Fuller) true identity.
