Dean is a demon and running amuck with Crowley while Sam tries to figure out what happened to his brother. Meanwhile, Castiel is dealing with his diminishing grace.

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Crowley is worried about Dean getting out of control, giving him a target to feed the mark. Sam struggles to escape from Cole. Hannah tries to convince Metatron to give Castiel's grace back.

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Sam continues to try to save Dean from the Mark of Cain. Realizing that Dean's antics are causing problems for him in hell, Crowley seeks help from a reluctant Castiel.

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Sam and Dean investigate a haunting at a theatre.

This is the 200th episode.

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Sam and Dean discover a group of witches "gone wild" and they attempt to stop them.

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Jody Mills is matched with an overeager partner during a mandatory sheriff's retreat; when a gruesome corpse is discovered, Jody calls Sam and Dean to help investigate.

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When Castiel finds Jimmy's daughter in a group home, she persuades him to break her out; Crowley is faced with a big challenge.

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Sam and Dean try to deal with the aftermath following the bloodbath. Castiel attempts to fix a struggling relationship with Claire, and Claire wants revenge on Dean for what he did to her friend.

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Charlie returns from Oz - Sam is scanning the internet for suspicious paranormal activity and comes across a video of Charlie beating up a district attorney. Dean suspects she's back from Oz and hunting on her own, assuming the district attorney must have been a demon. When they do find Charlie, they are shocked when she tells them why she really came back from Oz.

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Dean is mysteriously transformed into a teenager. He has to deal with teenage struggles all over again, along with being a hunter.

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Sam, Dean, and Castiel must deal with Cain's return. Rowena and Crowley grow closer.

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Castiel comes back and he and Sam check out a lead on the Mark of Cain. They decide to go to Bobby for help. Meanwhile Dean and Rowena meet up.

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Charlie contacts Sam and Dean after she finds the Book of the Damned - which could help eliminate the mark of Cain; Castiel and Metatron look for Castiel's grace.

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Castiel tries to reconnect Claire with her mother who went missing, and calls Sam and Dean for help with the case.

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While investigating a strange murder, Sam and Dean discover the killer has the same tattoo as those from the Styne family; Castiel plays referee when Charlie and Rowena must work together; Crowley turns to an old enemy for help with Rowena.

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Dean takes matters into his own hands regarding Stynes; Sam attempts to come to terms with his decision.

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Dean comes to a stunning decision that will alter his life -- as well as Sam's; Rowena and Crowley face off, putting Castiel in the middle.

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