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Dean falls increasingly under the spell of the First Blade. Meanwhile, Metatron makes his move against humanity, as Sam, Castiel, and Gadreel try to stop him.
Castiel calls on the Winchesters to help when his army of angel followers are attacked, and Dean is all too eager to help under the First Blade's influence.
While Sam and Dean help Castiel interrogate one of Metatron's angels, Abaddon takes extreme measures to force Crowley to help her against the Winchesters.
In Chicago, Sam and Dean encounter five clans of monsters that run the city's underground... and Ennis, a young would-be hunter who seeks revenge on one of the clans.
Sheriff Mills calls in Sam and Dean when a prisoner under her protection is abducted by vampires.
Metatron tries to get Castiel to join forces with him. Meanwhile, Sam and Dean capture Gadreel.
Sam goes to check out a report of peaceful people transforming into violent killers and discovers a connection to a case involving his grandfather. Meanwhile, Dean deals with the aftermaths of acquiring the Mark of Cain and Crowley is eager to take advantage of his weakness.
Crowley starts taking human blood again and Abaddon learns of his search for the First Blade. To find the Blade before the Knight of Hell does, Sam and Dean enlist the help of a former Man of Letters.
Sam and Dean travel to Washington to investigate the death of a young girl, only to discover that Harry and Ed, the Ghostfacers, have arrived before them.
While Castiel falls into the hands of Bartholomew and his faction of angels, Sam and Dean make a startling discovery about the Men of Letters bunker... and a special captive that Abaddon's demons are holding.
Sam and Dean go undercover at a spa when murder victims turn up hundred of pounds lighter after their deaths. The brothers soon discover that something is feeding on the victims' fat.
Garth ends up in the hospital, and Sam and Dean go to find out what happened. However, when they arrive, Garth goes on the run and the Winchesters are surprised to discover what really happened.
Crowley and a reluctant Dean go on a road trip to find The First Blade, the only weapon that kill their mutual enemy, Abaddon. Meanwhile, Castiel proposes to use Gadreel's remaining grace in Sam to track the angel, but warns that it could cause Sam permanent damage.
In the wake of Kevin's death, Castiel proposes a plan to Dean to help Sam retake control of his body from Gadreel. However, they have to turn to Crowley for help.
Sam and Dean investigate an angel slaughter and discover that Castiel is already looking into the matter. The individual responsible captures Castiel, while Dean wonders whether ti's time to tell Sam the truth about Ezekiel.
When four members of the same church chastity group disappear, Sheriff Jody Mills calls in Sam and Dean for help. However, Dean soon disappears and Sam and Jody have to go after him.
A man named Sonny calls Dean for help, and Sam is surprised to learn that Sonny and Dean spent time together at a home for delinquent boys. Sonny needs help dealing with a ghost and the Winchesters agree to help investigate. Meanwhile, Dean links up with an old girlfriend from his time in the home.moreless
When Castiel calls the Winchesters about mysterious disappearances in his neighborhood, Dean is forced to keep Sam (and Ezekiel) away from Castiel by asking to help Kevin and Crowley decipher the tablet. Meanwhile, Crowley asks for one phone call to Hell in return for his cooperation.
To solve two murders, Dean casts a spell to bond with the German Shepherd that witnessed both crimes. However, the spell has an... unfortunate side effect.
The Winchesters call Charlie in to help them with a Men of Letters computer, only to discover a strange green-webbed wall where they find a young woman named Dorothy inside Now they trio must join forces with Dorothy to stop the Wicked Witch from either returning to Oz or bringing Oz to the real world and wrecking havoc.moreless
Ezekiel warns the Winchesters that a group of disgruntled former angels are hunting their friend Castiel, and the brothers set out to find him before it's too late. Meanwhile, Castiel learns more about the human lifestyle.
Dean has a surprise for Sam and Kevin: Crowley, locked up in the trunk of the Impala. While they try to track down the demons on Earth, Abaddon continues with her plan to rule Hell.
Dean is devastated by the fact that the doctor tells him Sam won't make it, so he promises any angel willing to help that he will owe them a favor. Many angry angels want to find Dean and kill him, but Ezekiel gets to him first. At the same time, Sam is fighting for his life, and Castiel has a hard time surviving without his powers.moreless