The sisters have one chance to recapture the Book of Shadows or they will lose their powers forever.
The witch, that Piper thought she killed by blowing her up actually survived the attack and casts a spell on all three sisters to lower their inhibitions.
She is one of the original featured leads and, more specifically, a Charmed One – one of the most powerful witches of all time.
Piper initially possesses the power to freeze her surrounding environment.
In this episode, Piper finds out that Leo knew that she was married to Dan, but dating him (Leo).
Phoebe finds out that her sisters (cousins back in 1924) put a curse on her.