Someone to Witch Over Me

Agent Brody convinces Paige to help him solve a mysterious string of accidents, only to discover that the demon Sarpedon is capturing innocents' Guardian Angels and using them to protect himself from the forthcoming threat of a New Power.   Meanwhile, Piper and Phoebe convince Leo to go on a Vision Quest to face his demons.  While on his Quest, Leo finds guidance from his son Chris, but awakens to find Piper and Phoebe killed by Sarpedon.  An Avatar, part of the New Power, offers to bring them back to life if Leo turns over his free will.