Sam and Dean come across a series of novels called Supernatural depicting their lives as demon hunters in detail. The brothers meet the author, who explains he has visions of Sam and Dean in action then puts their adventures in his novels.
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Sam and Dean are on a hunting trip when they receive a call from an Adam Milligan, who is trying to find John Winchester. They discover that Adam was conceived 19 years ago when his mother fell in love with John Winchester.
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Dean has a dream about Castiel asking to meet him in private. Sam and Dean are shocked to discover Castiel's human host, Jimmy, is back in control. Jimmy wants his life back but Sam and Dean believe he is in danger.
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Sam is locked in Bobby's panic room to cleanse his body from demon blood. However, after several seals are broken Bobby wants to set Sam free to help stop the Apocalypse and Dean seeks out Castiel for help.
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Hunter Rufus Turner calls in Bobby, Sam, and Dean to deal with a demon infestation in his town, but they soon discover the truth is much more horrifying. Meanwhile, Castiel goes to seek the only entity that can defeat Lucifer.
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Sam decides to stop hunting but has a hard time after he receives a surprise visit. Dean and Castiel try to find the Archangel Raphael in their bid to stop the Apocalypse.
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Dean refuses Sam's efforts to help him battle the Devil, and then wakes up to find himself five years in the future, in a wasteland where Lucifer has begun his endgame by unleashing a virus that transforms humans into zombies.
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Sam and Dean get themselves admitted to a mental hospital in order to investigate if a monster is attacking patients. But their incarceration pushes them to the breaking point.
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Teenagers decide to collect on the bounty on Dean's head by one of them switching bodies with Sam. While Sam has to deal with domineering parents and high school, Dean discovers Sam has a new enthusiasm for the monster-hunting profession.
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Anna travels in time to kill Mary and John before they can conceive Sam and Dean, preventing the apocalypse. Castiel transports the brothers to save their parents but they must answer questions when their parents wonder what's going on.
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