I love this episode! This episode places whitelighters, and therefore witches, everywhere under threat. So what else is new, right? The Charmed Ones Save the World on a weekly basis, but this is different to the usual demon tries to take out the sisters, or darklighter tries to kill a couple Whitelighters; this combines both-A warlock named Eames is a warlock of strategy, a rare thing in the world of evil. He kills specific witches to gain the powers he needs; deflection, cloning, transmogrification. He uses these powers to kill a darklighter, to gain the power to kill a whitelighter. He then kills a Whitelighter to get the power to orb "up there". Once there he could wipe out all whitelighters, leaving all witches unprotected, but the Charmed Ones figure it out and destroy him, a la charmed ones!
The humour in this is quite amusing. Natalie gets appointed as the girls Whitelighter and is a hardfast believer in rules, something the sisters hate the concept of. As Natalie replaced Leo, the girls dislike her from the beginning. If you've seen it, you'll know what im talking about when i say that the practice fight scene in the alley is funny to say the least.
All in all, a great episode,one of the best of season 3!