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Dean considers giving up and giving in, but Zachariah comes up with a new strategy against Lucifer that means they no longer need Dean as Michael's vessel. However, the consequences will cause even greater destruction, and the Winchesters and Castiel must stop Zachariah before it's too late.
When several people kill themselves under strange circumstances, Sam and Dean discover that they were driven insane by the Goddess of Truth, who forced them to tell the truth against their will. However, when the brothers track down the goddess, Veritas, she uses her powers on Dean.
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.
When Meg boasts that John is her prisoner, the boys visit a friend of their father's to get information about demonic possessions and ways to trap a demon. It turns out Meg is not what she appears.
In the aftermath of the car crash, the surviving Winchesters go to the hospital, where one is stalked by a Reaper while another must consider sacrificing himself to save the others.
Dean gets transported back in time and ends up in Lawrence, Kansas, where he crosses paths with a young version of his parents, who have just fallen in love.
While trying to rescue Dean, who has been thrown back into 1944 by the God of Time and must deal with Eliot Ness, Sam deals with the unexpected return of an old friend.
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
The brothers look into the death of Rabbi Bass, who spontaneously combusted. Things get complicated when they find out that the rabbi was researching Nazi necromancers. A golem that belongs to the Rabbi's grandson, Aaron, attacks them. However, since Aaron doesn't know how to control him, everyone is in danger.
Kevin translates the tablet and finds the way to close the gates of Hell. He tells Sam and Dean that in order to do so, one person has to face three tasks designed by God, one of which is killing a hellhound, and the brothers argue about who should complete the tasks.moreless
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
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.
Sam and Dean return to follow up on an old case, the exorcism of a demon from a postal worker, when they discover that the demon has returned and is killing women, just like it did four years ago.
The brothers get word that Dick Roman has obtained Frank's hard drive and is using an unsuspecting hacker to decrypt it. While the Winchesters try to find her, Bobby tries to help them but finds himself giving in to his rage against the Leviathan CEO.
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
Sam and Dean's grandfather travels forward through time to the present to get help from John Winchester in stopping a demon, Abaddon.
Dean calls a demon to make a deal to save a man named Evan Hudson, in exchange for himself. While making the deal, the demon confronts Dean’s worst nightmare about their dad.
Dean is concerned about the physical impact the second trial had on Sam, so he insists that Sam stop hunting for a while. When Charlie comes across a case and finds the boys, Dean decides it's time to teach her how to be a hunter. However, the boys suspect she is hiding something from them that could get her killed.moreless
Sam and Dean look into the deaths of two people involved in Live Action Role Playing (LARP), playing a game named Moondoor. They discover that Charlie Bradbury is involved in the game and soon learn that someone has summoned a fairy to kill his or her enemies.
Castiel spares Bobby and the Winchesters and goes on his way to set right the wrongs of the world. However, when the brothers try to bind Death and use him to stop the new God, they discover that their former ally is one step ahead of them.
Hunter Garth calls on Sam and Dean for help when he comes up against a Shojo, a Japanese creature that can only be seen and fought when the hunter is drunk.
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.
While Dean goes after Dick Roman, Sam tries to help a girl whose father, a hunter, disappeared while investigating a truck stop.
A former client of Dean's calls him up when a plane crashes under mysterious circumstances. Dean and Sam must board an endangered flight to save the other passengers.
A ballerina is killed by a pair of cursed dancing shoes, and Dean starts to fall victim to the same curse. However, that's the least of the brothers' concerns when they discover that the store where the shoes were sold has been bought out by Leviathans.
When Lucifer pays Sam another visit, he drives him to the brink, forcing Sam to enter a mental hospital. Fearing for his brother's life, Dean takes matters into his own hands, calling upon every hunter he knows. He receives the name of a healer from one hunter, only to find a familiar face waiting for him.moreless
Meg summons Sam and Dean when Castiel wakes up. However, the brothers have other problems on their hands when they get word of a teenager who has been struck by lightning and become a prophet, and may hold the key to defeating the Leviathans.
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.
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.
The brothers return to Kansas to investigate a children's pizza parlor that is connected to the death of several parents whose children all attended parties there. While Dean confronts the individual responsible, Sam has to deal with his worst fear: clowns.
An old hunter acquaintance calls Sam and Dean in to investigate a haunted house, but when she disappears before they arrive, they discover that a powerful ghost inhabits the house.
The Leviathan possession of Castiel has devastating consequences which leads Sam, Dean, and Bobby back to Sioux Falls, Meanwhile, Sam puts himself and Dean in danger as he begins to crack under intense pressure from Lucifer's mind games.
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.
While Sam and Dean are busy on a hunt, Bobby recruits an old friend to investigate a case from his past.
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 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.
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.
Dean meets an intriguing woman at a bar while investigating attacks where the victims were branded with a strange symbol after their hands and feet were cut off.
While investigating murders involving an avenging ghost, Sam and Dean discover that Garth has taken on Bobby's role as hunter coordinator.
The town of Milan, Ohio, is plagued by a series of calls where the victims are contacted by dead loved ones, and urged to commit suicide. When Dean and Sam investigate, Dean gets a call of his own and the two brothers are soon at odds.
A siren casts a spell on men in a small Iowa town, driving them to kill their wives.
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.
Metatron tries to get Castiel to join forces with him. Meanwhile, Sam and Dean capture Gadreel.
The Winchesters investigate a case involving an amnesiac zombie and discover that he's the Greek Titan, Prometheus... and that the goddess Artemis wants him dead.
One year after their battle with the Leviathans, Sam finally finds his brother Dean, who reveals what happened to him and Castiel in Purgatory. They soon reunite with the prophet Kevin and learn about another Word of God... and an unbelievable opportunity.
The Winchesters and their allies, including Bobby, Castiel, Meg, and the Prophet Kevin, must try and stop Dick Roman and his Leviathans in a final showdown.
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.
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.
An angry ghost goes after mediums in Lily Dale, the most psychic town in America, and the brothers have to figure out who the next victim will be from a population filled with nothing but psychics.
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.
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.
Sam and Dean meet up with an old friend, Krissy Chambers, and discover that a Hunter has taken her and other orphans in and is teaching them how to be Hunters. Dean is suspicious of the Hunter's motives, while Sam is interested in how the man is giving the orphans a home life, something he never had.moreless
Sam abandons Dean to investigate a case from his childhood that he thought he had solved: a demon that kills criminals and eats their brains.
Two Leviathans take on the form of Sam and Dean and frame them for a series of murders. While the brothers take refuge with a surveillance expert, Bobby tries to figure out how to kill the Leviathans and clear the Winchester brothers' names.
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
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.
Sheriff Mills calls in Sam and Dean when a prisoner under her protection is abducted by vampires.
Sam and Dean take on a case with Castiel, who has decided to become a hunter. However, they discover that the murder is only the latest in a string of cartoon deaths.
Dean goes to help Benny, who has run afoul of vampires guarding his Maker. Left alone, Sam thinks about his year of retirement, but is soon called back in when Dean calls him for help.
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.
The Egyptian god Osiris wreaks a bloody trail of deaths as he tries and executes anyone guilty of past mistakes. Sam is forced to defend his brother when Osiris targets Dean for his guilt over all the things he's believed he's done in his life... and calls Jo as a witness.moreless
Dean and Sam must search for three key items in order to defeat Dick Roman and the Leviathans. Their quest takes them to Crowley and the Alpha vampire, but the Leviathans will stop at nothing to kill the Winchesters and put their plan for global domination into effect.
Sam and Dean are faced with magicians delving in black magic. They investigate after several people wind up dead in ways similar to the illusions the magicians perform on stage.
Sam asks a friend, hunter Martin Creaser, to track Benny just to be on the safe side. However, when Martin gets word of a vampire kill in Benny's neighborhood, he takes things into his own hands, forcing Dean to make a tough choice.
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
After a series of brutal murders where the victims had their hearts torn out, the Winchesters track down and locate the killer. However, they soon realize that he's not the only killer and the others are still at large.
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, Dean, and Bobby go on a hunting trip for the Jersey Devil, and get involved in a restaurant with tainted birdburgers.
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.
Sam and Dean deal with a witch who is using her powers to terrorize a small town. They soon discover that she is taking out her anger with her husband, who she discovered was having an affair.
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.
When Sam teams up with a familiar face, Dean is forced to team up with a laid-back hunter, Garth, and ends up working at cross purposes to his brother.
A witch's familiar asks the Winchesters for help when the witch, a cop who helped Sam and Dean on a case, has nightmares of murder that come true.
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.
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.
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.
The Winchesters track down a killer and the investigation leads them to found footage of three college students investigating mysterious animal attacks.
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.
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.