Kyle 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 Avatars. Consequently, Paige's Guardian is captured by the demon and she becomes 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 Avatars Alpha and Gamma, who appear to reason with him during the vision quest. Back at the manor, Sarpedon gets a drop on the sisters and a battle ensues where Piper and Phoebe die. In order to bring Piper and Phoebe back to life, Leo agrees with and becomes an Avatar.