Sam and Dean check on Lucifer and Chuck to find Lucifer gone and Castiel back and Chuck fatally injured. As a result of Chuck’s injuries, the sun is now dying and the world along with it. Realizing that the only chance for the world to survive is to kill the Darkness along with Chuck, the Winchesters begin gathering ghosts to create a bomb to destroy the Darkness. With the help of Billie the Reaper, they are able to get the needed souls which are inserted into Dean. Chuck sends Dean to Amara who has started to regret her actions and Dean convinces Amara that revenge is not worth it. Amara and Chuck reconcile and Amara heals Chuck of the damage she did to him. The two then leave the Earth, but not before Amara tells Dean she is going to give him what he wants most for helping her. At the bunker, Castiel is banished by a woman who identifies herself as Lady Antonia Bevell of the London chapter of the Men of Letters. Antonia tells Sam the Men of Letters have sent her to bring Sam in for punishment for his actions and fires her gun, apparently at Sam as he tries to talk her down. Making his way through the woods, Dean finds his resurrected mother.