Spin City

Piper is held prisoner by the Spider Demon, a creature that emerges once a century in order feed off of a powerful magical being. Chris is infected by the spider's venom during the attack, which causes him to begin mutating into a spider himself. It's up to Paige, Pheobe and Leo to rescue Piper from the spider's web, and reverse the effects on Chris. Also, Leo finally figures out why Chris resents him.