S07E15: Show Ghouls (Remastered)

When Darryl fears his friend Mike is possessed, Phoebe, Paige and Drake discover that Mike had been working close to a site where a cabaret was destroyed in a fire in 1899, killing hundreds of people. The spirit of one of the victims is using Mike to plead for help on behalf of all the Lost Souls who are trapped in the cabaret, forced to relive that night for eternity. Phoebe and Paige use a spell to enter the cabaret where they learn that the Count who runs it made a pact with a demon named Sargon to cause this. The sisters learn they vanquished him five years before so they can't force him to undo it and the Count possesses Drake's body and leaves Phoebe and Drake to die in the cabaret. Phoebe manages to escape and the sisters cast the Count from Drake's body and he is dragged to hell. Drake returns to his own body and getting rid of the Count's spirit frees the other Lost Souls and they finally move on.