Prue and Phoebe are wondering if Piper will ever return from "up there" with ...
Charmed
Season 3 Episode 19: The Demon Who Came in from the Cold
Cole officially joins the good fight when he goes undercover in an underworld brotherhood to help Prue, Phoebe, Piper, and Leo learn more about the evil. Their trust in him falters when it looks as though they are being double-crossed.