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Dean is enjoying life as a demon and carousing with Crowley. Meanwhile, Sam tries to figure out what happened to his brother, and Castiel deals with his diminishing grace.

Dean becomes more aggressive as a demon, and Crowley tells him it's because the Mark of Cain needs to be fed. Meanwhile, Sam is captured by an angry man who blames Dean for his father's death and wants revenge.

Sam tries to release Dean from the Mark of Cain. Meanwhile, Crowley seeks the help of an unlikely ally after encountering problems due to Dean's behaviour.

A series of werewolf attacks points to Kate, the werewolf Sam and Dean let live.

Sam and Dean investigate the disappearance of a teacher and are stunned to learn that the victim's school is putting on a musical based on their lives. The 200th episode of the series.

Dean learns that Bobby or his next of kin have been named as a beneficiary in an heiress' will, so he convinces Sam to take a road trip with him to claim their fortune. When they arrive, things aren't quite as they had hoped or imagined.

Rowena returns and tries to recruit and train followers in the art of witchcraft, but Sam and Dean devise a plan to stop her. Meanwhile, Hannah runs into a blast from her vessel's past, which complicates things for her and Castiel.

Jody Mills reluctantly attends a mandatory sheriff's retreat and is partnered with an overeager sheriff who wants to bond. Even worse, a body with just strings of meat and skin hanging off the bones is discovered. Jody calls Sam and Dean for help.

Castiel finds Jimmy's daughter, Claire, in a group home, and she convinces him to break her out. After she runs away from him, Castiel calls Sam and Dean to help find her before she gets into trouble. Meanwhile, Crowley faces his biggest challenge.

Sam and Dean double their efforts to find a cure for the Mark of Cain after the massacre at the ranch. Meanwhile, Rowena plots against Crowley, and Castiel tries to mend his relationship with Claire.

Charlie returns from Oz and is seen on video beating up a district attorney. Dean suspects she is hunting on her own and the D.A. must be a demon.

Sam and Dean investigate when people suddenly disappear into thin air with only their clothes left behind. Their probe reveals that Hansel, from Hansel and Gretel lore, is kidnapping people and turning them into their younger selves.

Sam and Dean try to stop a ghost who is taking revenge against a group of college students by killing people through various electronic devices.

Dean, Sam and Castiel deal with Cain's return. Meanwhile, Crowley and Rowena continue to grow closer, but Rowena confronts him when he bails on plans with his mother to help the Winchesters.

Sam and Dean team up with Cole to investigate a new murder case. Their probe reveals that a Khan worm is infecting men and turning them into killers. Unfortunately, the worm makes it's way into Cole.

Sam and Dean investigate a series of suicides committed by people who all killed themselves with self-administered disembowelment. The probe reveals victims were all members of a Catholic church and had recently given confession.

Sam and Castiel check out a lead about the Mark of Cain. Dean and Rowena meet.

Charlie calls Sam and Dean and tells them she found the Book of the Dead that could help remove the Mark of Cain. Unfortunately, a man who claims the book belongs to his family shoots her. Meanwhile, Castiel and Metatron take a road trip.

Sam searches for a magical box built by former Men of Letters that may be able to cure Dean of the Mark of Cain. But the box contains a deadly alarm system that puts the brothers' lives in danger.

Castiel tries to help Claire Novak find her mom, who has been missing for years. He feels guilty for what he did to the Novak family and wants to make amends by reuniting Claire with her mother.

Sam and Dean investigate a bizarre murder and realise the killer has the same tattoo as those from the Styne family. Meanwhile, Castiel acts as referee when Charlie and Rowena are forced to work together on the Book of the Damned.

Dean decides to take matters into his own hands when it comes to the Stynes, and Sam tries to come to terms with his decision.

Dean makes a shocking decision regarding the Mark of Cain that may change not only his life but Sam's too. Meanwhile, Crowley and Rowena face-off, and Castiel gets caught in the middle.