Charmed

Season 8, Episode 21

Episode Title: Kill Billie: Vol. 2

Air Date: 2006-05-14

Overview:

Forced to hide from Billie and Christy, the Charmed Ones find themselves stuck in the Underworld. Meanwhile, Leo appears to Piper and offers demonic approval; Coop searches for Phoebe; Billie & Christy resort to summoning the Hollow to stop the Charmed Ones and the Charmed Ones do the same.