Castiel gets a job and starts enjoying life as a human, but when he learns about some local disappearances he asks Dean to help him investigate. Meanwhile, Crowley agrees to help decipher the tablet in return for one phone call to hell.
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Dean helps an old friend with a ghost problem at a home for delinquent boys. Dean was sent there years before for stealing food. When Sam learns about Dean's past he is stunned and asks for more information, which Dean is reluctant to give.
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Sheriff Mills asks Sam and Dean to help her investigate the murders of four members of a church chastity group. Dean disappears shortly after the brothers join the group; and Sam and the sheriff team up to rescue him.
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An angel war begins and a massive amount of angels are slaughtered. Sam and Dean investigate and run into Castiel who is soon captured and tortured. Dean questions Ezekiel's demands and wonders if it is time to tell Sam the truth.
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Dean hunts the angel who killed Kevin and tries to separate Sam's brain from an angels mind in order to expel Gadreel. However, the only person who knows how to do that is Crowley.
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Crowley, who wants to reclaim his place as king of hell, seeks Dean's help to find the first blade, the only blade that can kill Abbadon. Unfortunately, Cain, the first-born son, controls it.
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Sam and Dean work undercover at a spa to investigate murders in which the victims were hundreds of pounds lighter after their deaths. All of the victims attended the spa for weight loss; and the brothers suspect that witches are to blame.
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