Someone to Witch Over Me

Federal agent Kyle 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 the New Power (the Avatars). Consequently, Paige's Guardian is captured by the demon and she becomes maddeningly accident prone. Meanwhile, Piper and Phoebe convince Leo to go on a vision quest in an attempt to come to grip with the visions and visitations he has been experiencing. He resists the arguments and blandishments of the avatars Alpha and Gamma who appear to reason with him during the vision quest, and back at home, the guardian snatching demon gets a drop on the sisters and a battle ensues where Piper and Phoebe die after going to the kitchen from their sanctuary of the attic wards. Shown the Mansion, Leo agrees with and becomes an Avatar in order to bring Piper and Phoebe back to life.