The Charmed Ones are challenged by the Enochs, a street gang consisting of demons who render themselves invisible before killing innocents. The Enochs use their ability to cover their tracks in a plan to convince the girls that the rival Sokol street gang is the one they should be trying to vanquish. Elsewhere, Piper (Holly Marie Combs) discovers that Leo (Brian Krause) is an Avatar -- while Leo himself receives a startling message from a female Whitelighter Elder. ~ Hal Erickson, Rovi