Once in a Blue Moon

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 the blue moon. Kyle tells Paige his story in reference to the new power. And the sisters, seeing the floating heads themselves, see that Leo isn't so crazy after all.