Charmed: Once in a Blue Moon

The Charmed Ones are assigned a different Whitelighter after the Elders begin to distrust Leo, but Leo is blamed for a savage attack that befalls the replacement Whitelighter. When the Charmed Ones begin their own investigation to clear Leo's name, they learn the beasts in question said to have attacked the Whitelighter are simply themselves, transformed whenever a blue moon is out. Meanwhile, Agent Brody tries to warn Paige about a growing danger after learning more about her, while Phoebe and Les chat and decide to go their separate ways.