Synopsis

Fleeing the pursuit of Billie and Christy, the Charmed Ones find themselves unexpectedly trapped within the Underworld. As they struggle for a way back, Leo appears to Piper, offering a chillingly familiar endorsement. Elsewhere, Coop embarks on a desperate search for Phoebe. Back in the mortal realm, Billie and Christy turn to dark magic, summoning the Hollow in a bid to halt the Charmed Ones' progress, a move mirrored by the sisters themselves.