Castiel turns to Sam and Dean for help, when he tries to help the daughter of the man he's possessing but she escapes. Meanwhile, Crowley and Rowena have a chat, and Dean worries about what will happen if he gives in to the Mark again.moreless
Sam and Dean track down a demon prostitution ring which leads them to the witch Rowena. They go after her, unaware that Cole is still on Dean's trail. Meanwhile, the husband of Hannah's host body comes looking for his wife, complicating things for Hannah and Castiel.moreless
Sam tries to cure Dean and remove his demonic essence, but discovers that his brother doesn't want to be cured. Meanwhile, Crowley realizes that he will need someone to rally the forces of Hell behind to maintain their loyalty, and seeks out a dying Castiel.moreless
Crowley discovers that Dean is becoming increasingly difficult to control, and contacts Sam to make a deal. Meanwhile, Sam escapes from Cole and returns to his hunt for his brother, and Hannah tries to make a deal with Metatron to save Castiel's life.moreless
Dean embraces his new life as a demon and hits the bars with Crowley. Meanwhile, Sam tries to track down his brother, unwilling to accept what Dean has become, and runs afoul of a man trying to get revenge on Dean for a past crime.moreless
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.
An old enemy returns and attempts to move the Warehouse - and plans to use Claudia's sister to do it.
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.
Paracelsus takes control of Warehouse 13 and uses his newfound abilities to terrorize the team... and then travel back in time to create an new timeline where he rules the warehouse.
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.moreless
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.moreless
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.moreless
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.
After learning of Neal's betrayal and part in Peter's release from prison, Peter is unwilling to forgive Neal and considers taking a new job as section chief in D.C. Meanwhile, Curtis Hagen captures Rebecca and pressures Neal and Mozzie into deciphering the hidden message from the codex that will lead to a mysterious treasure.moreless
When a stolen shipping crate containing a fossilized dinosaur egg shows up, Peter and Neal try to find the Tyrannosaurus Rex skeleton that belongs to the egg. Meanwhile, Peter learns of Neal and Rebecca's relationship and Neal realizes his lie about his identity is getting in the way of his feelings for Rebecca.moreless
In this special episode by the people behind The Doctors Revisited, cast and creators tell us everything we need to know about the Doctor: who he is, the nature of his relationships with his travelling companions, and his most celebrated foes.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.moreless
Peter is getting used to his new assignments and Neal has to make a museum heist work.
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
Peter is charged with Senator Pratt's murder and Neal tries to exonerate him.
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.moreless
Using the tablet half in his possession, Crowley prepares to make his final move in the grand game against Heaven. Only Dean, Sam, and Kevin can stop him. Meanwhile, Castiel and Metatron join forces and try to stop Naomi's scheme.moreless
Sam, Dean and Castiel are reunited and search the files of the Men of the Letters to find a film that could help them figure out the third trial. Meanwhile, Metatron asks for Castiel's advice about the problems in Heaven, and Crowley delves into the brothers' past... and some familiar facesmoreless
Sam and Dean receive a video message from Kevin which leads them to a casino in Colorado, where they find a mysterious recluse that might help them fill in the gaps in Kevin's research. At the same time, Crowley is winning at the tables. Meanwhile, Castiel tries to escape from Naomi and the other angels that are after him.moreless
Kevin calls in Sam and Dean when he hears Crowley inside of his mind. The brothers end up turning to Ajay, a Reaper, to help Sam with the second trial of the Tablet. Meanwhile, Naomi secretly visits Dean and gives him vital information, forcing him to seek out Benny's help.moreless
Castiel returns and asks Sam and Dean to help him against demons seeking Lucifer's Crypt. When they set out to take on the demons, they rescue Meg, who is being interrogated for information. While Dean and Castiel go to find the Crypt, Sam and Meg fight a rearguard action to hold Crowley off.moreless
Naomi informs Castiel that Crowley holds an angel captive and he must save him so that Crowley doesn't learn their secrets. Castiel asks for Dean's help. Sam meets with Amelia, who asks him to chose whether to stay with her or never contact her again.moreless
Nate puts everything on the line for himself and his team when he takes on a case that is connected to his son's death.
Sam and Dean are surprised to discover that Castiel has escaped from Purgatory, but doesn't remember how. Meanwhile, Kevin and his mother turn to a witch for help against Crowley but she betrays them to the King of Hell.moreless
Crowley takes Kevin's mother hostage in an attempt to recover Kevin as he searches for the tablet. The Winchesters help Kevin rescue her, only to discover that she insists on joining them on their quest.moreless