The seventh season of Supernatural comes to a close tonight, with the episode “Survival of the Fittest.”

Tonight at 9/8c on The CW, Supernatural‘s last Friday night episode airs (the show is moving to Wednesdays in the fall). After struggling with the rise of the Leviathans all season and suffering the (temporary) losses of Castiel, Bobby and the Impala, Sam and Dean are ready to take the fight to Dick himself.

Watch the promo:

This is a sentimental episode in a lot of ways, mainly because it is Sera Gamble’s last episode as showrunner before Jeremy Carver takes over for season 8. We also have to wonder if this won’t be the last appearance of our beloved fallen angel or Bobby the ghost.

Any theories? How will this episode lead into the next season?