Supernatural

Sam tries to figure out what has happened to Dean, who is now a demon running around with Crowley. Meanwhile, Castiel faces his diminishing grace.

Crowley notices Dean's increasing levels of aggression, and a vengeful man named Cole captures and tortures Sam.

Sam continues in his efforts to save Dean from the Mark of Cain. Crowley realises that Dean's demonic antics are starting to cause problems for him in Hell so he seeks out an unlikely ally: a reluctant Castiel.

Sam and Dean investigate a recent series of werewolf attacks in Washington State in an attempt to find out who is responsible.

When Sam and Dean investigate the disappearance of a teacher in Flint, Michigan, they are stunned to discover that the drama department of the school where she worked is putting on a musical based on their lives.

Dean and Sam go to claim their fortune after discovering that Bobby or his next of kin have been named as a beneficiary in an heiress's will.

Sam and Dean encounter a demon who is running from Crowley, but before they can do anything, Rowena intervenes; Hannah runs into someone from her vessel's past.

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.

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

In search of a cure for the Mark of Cain, Castiel comes up with an idea that Sam does not support; as Rowena plots against Crowley, Castiel tries to make things right with Claire.

When Sam comes across a video of Charlie attacking a district attorney, Dean thinks she has returned from Oz to hunt on her own.

Sam and Dean tackle a case where people vanish into thin air, leaving only their clothes behind; Dean becomes a victim.

Dean and Sam race to stop a vengeful ghost who has been killing people through various electronic devices.

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

Sam ignores Dean's directive and continues to search for a cure; a new murder case brings the brothers in contact with Cole -- who ends up being infected by a Khan worm that turns men into murderers.

Dean and Sam investigate grisly, identical suicides committed by various people with little in common; the brothers begin to suspect that a priest is involved.

Castiel and Sam pursue a lead about the Mark of Cain, and Rowena and Dean have an encounter.

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

Sam looks for a magical box built by former Men of Letters, Magnus, hoping it will cure Dean, but is surprised by a deadly alarm system.

Castiel asks Sam and Dean to help Claire find her mother, but when they learn what took the woman, they suspect a happy ending is impossible.

While investigating a strange murder, Sam and Dean discover the killer has the same tattoo as those from the Styne family.

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

Dean makes a shocking decision about the Mark of Cain that could change not only his life, but also Sam's. When Crowley and Rowena confront each other, Castiel finds himself caught in the middle.