We have the synopsis for episode Supernatural Season 13 episode 7.
 
“War of the Worlds” — (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)

THE RACE IS ON TO FIND JACK – As Sam (Jared Padalecki) and Dean (Jensen Ackles) continue their search for Jack (Alexander Calvert), with Asmodeus (guest star Jeffrey Vincent Parise) hot on their trail, they stumble across a familiar foe. Meanwhile, Lucifer (Mark Pellegrino) manages to escape Michael’s (guest star Christian Keyes) grasp and finds himself an unlikely and mostly unwilling ally. The episode directed by Richard Speight, Jr. was written by Brad Buckner and Eugenie Ross-Leming (#1307). Original airdate 11/23/2017.
 
So Jack has disappeared? And everyone is looking for him, except maydbe Cas? We go back to Lucifer, but Mary seems to be missing in action, unless she's the ally. What do you think? Let us know in the comments or in the discussion thread for episode 7.