Once in a Blue Moon

Once In a Blue Moon is the 140th episode of Charmed.

Episode Information

 * Season          7
 * Episode No.     06
 * Original Airdate October 17, 2004

Summary
The Elders' suspicion of Leo causes them to assign a new Whitelighter to the girls. However, when the new Whitelighter is nearly killed by beasts, the Elders blame the attack on Leo. Trying to prove Leo's innocence, Piper, Phoebe and Paige discover that the beasts are actually the Charmed Ones' themselves, transformed by a blue moon.