21. Look Who's Barking

Complete story — includes the ending

Phoebe has a premonition of a young woman being killed by a demon in a phone booth whilst adding on to the Belthazor section of the Book of Shadows, thus causing her to think Cole is responsible. However, the sisters realize that this murder does not follow Cole's pattern. Piper learns that it is actually the demon on the reverse page that's responsible; a Banshee. The sisters then cast a spell to track down the banshee which turns Prue into a dog, but Prue gets hit by a car. The driver takes her home to care for her, thus taking her out of the action. When the banshee attacks the Halliwell manor she surprises Phoebe in the attic and, sensing her immense pain, which is what the banshee feeds on, over Cole's betrayal, screams at her. It is later discovered that although this scream would kill mortals, it has a very different effect on witches: it turns them into a banshee too. Piper blows the Banshee up but it is too late, Phoebe has already turned into a banshee. Leo warns Piper that if Phoebe kills, she will stay a banshee forever.