We have an all-new episode tonight, but here's a glimpse of what we can expect in the future, specifically for Episode 19. As a Lost fan, I like Mark Pellegrino, so it will be nice to have Lucifer back (probably not so nice for our boys, though):
LUCIFER (MARK PELLEGRINO, “LOST”) RETURNS — Sam (Jared Padalecki) and Dean (Jensen Ackles) are kidnapped by a group of gods, including Kali (guest star Rekha Sharma), Ganesh (guest star Keith Blackman Dallas) and Bladur (guest star Adam Croasdell) and held hostage in a small hotel. The gods want to use Sam and Dean as bargaining chips to stop the Apocalypse, but Gabriel (guest star Richard Speight, Jr.) shows up and warns them that if Lucifer finds them he will kill them all. Unfortunately, one of the gods turns on the rest and Lucifer appears.