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As the apocalypse approaches, Dean tries to find Sam to stop him from trying to kill Lilith. Dean must face the choice whether he will kill his brother.
Dean and Bobby lock Sam in Bobby's panic room in order to let him detox from demon blood.
Castiel appears to Dean in a dream and tells him he has something to say to him in private. Dan and Sam go searching for Castiel, but find Jimmy, Castiel's human vessel, instead.
Dean and Sam find a boy named Adam, whose life changes when he becomes a monster. Adam may be the third Winchester brother.
Sam and Dean find a series of books named "Supernatural" that is based on their lives as demon hunters. They track down the writer, Carver Edlund, who turns his visions into the books.
Someone finds Lucifer's sword and uses it to kill angels. Castiel and Uriel capture Alastair and try to get Dean to use his torturing skills to learn how to stop the murders.
Dean and Sam have no idea what they're dealing with when they stumble upon a town where no one can die! A woman survives a fatal car crash, a man walks away unscathed after falling off a building, and a 6 year old girl lives after flat lining.
Sam and Dean go to a small town in Iowa, where three men have beat their wives to death. The guys figure out that a Siren is the cause of the deaths. The Siren eventually puts Sam and Dean under her spell and makes them fight each other to the death!
Sam and Dean investigate a haunting at a high school they attended as children. The episode will contain flashbacks of what high school was like for them.
Sam and Dean investigate magicians delving in black magic after several people wind up dead in similar ways to the illusions performed on stage.
Sam and Dean investigate a farm house that is haunted by a woman living in the walls.