Sam and Dean take a break from looking for Amara to check out a case of a girl going into a coma. They soon discover that their case is connected to a similar case that Bobby and Rufus investigated several years ago... and never completely solved.
Sam and Dean save a couple from two werewolves, but Sam is shot in the process. Dean tries to get Sam and the couple to safety, but Sam dies... and Dean is forced to abandon him.
Sam and Dean try to convince Crowley to turn over the Horn of Joshua before destroying Lucifer--and Castiel--rather than after they use the Horn to defeat Amara. Meanwhile, an unexpected ally helps Amara heal from her injuries, and Lucifer makes the angels in Heaven an offer they can't refuse.
The Winchesters investigate a series of mysterious disappearances every 27 years, and run into a pair of hunters where one is looking for revenge against the creatures that took his brother.
The brothers investigate a murder-suicide in Colorado that may be tied to Amara. Meanwhile, Metatron receives a request to edit a new book.
Sam and Dean try to come up with a way tor rescue Lucifer, and discover Chuck's plan to deal with Amara. Meanwhile, a new Prophet is awakened, but he's less than thrilled at the promotion.
To defeat Amara, Sam and Dean will first have to help Chuck and Lucifer reconcile. Once they do, they then must gather the forces of Heaven, Hell, and Magic to weaken Amara so that Chuck can defeat her. However, everything doesn't go quite according to plan.
It's the end of the world as Chuck's death extinguishes the sun. Desperate, the Winchesters, Castiel, Crowley, and Rowena come up with a plan... but to succeed, one of them will have to die.
While Dean brings Mary up to speed on what has happened in the 30 years since she's died, Sam faces tortured at the hands of the Men of Letters. Meanwhile, Crowley tries to track down a weakened Lucifer, who is hopping from body to body.
Dean and Castiel continue their efforts to find Sam, and Mary insists on accompanying them. Meanwhile, Castiel recruits Rowena in his attempts to send Lucifer back to the cage.
When a crying baby leads to death in a mysterious abandoned house, Mary, Sam and Dean decide to investigate. Meanwhile, Castiel's hunt for Lucifer leads him, begrudgingly, to partner up with Crowley.
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