Dean and Sam get to know the whereabouts of Lucifer and want to hunt him down. But Lucifer is well prepared and is working his own plans.

Crowley offers to help the brothers hunt down Pestilence and reclaim his ring, while Dean gets a lesson in trust when Sam's history with the Four Horsemen's demon `Stable Boy' is revealed.

Bobby sells Crowley his soul in exchange for the location of Death, while Pestilence infects the Winchesters with a deadly disease.

After Bobby discovers Crowley has no intentions of returning his soul, the hunter takes matters into his own hands.

Dean becomes suspicious of Samuel's motives, but Sam isn't sold on the idea that their grandfather is doing anything wrong. The brothers go along on a hunt with Samuel and the other Campbells, but things go terribly awry.

Crowley forces Dean and Sam to bring him an alpha monster. They go after a skinwalker, who plans to infiltrate his people into homes disguised as dogs and then have them all bite and transform their owners, creating a growing army.

Dean and Sam are captured by Meg who wants to know Crowley's hideout. Sam proposes to show where Crowley is provided she gets his soul back. The Winchester brothers ask the reluctant Samuel who has made a deal with Crowley to have his daughter Mary back but he finally points out the spot. Dean and Sam break into an old prison with Castiel, Meg and two other demons to seek out Crowley, but they are betrayed by Samuel. Castiel escapes, but Sam and Dean are arrested and Meg is tortured by Christian. Will that be the end of the quest of the Winchester brothers for Sam's soul?

Dean, Sam, Castiel and Bobby find Eve in a small town where the citizens have been converted to demons; Eve decides to torture Sam and Dean by bringing their mother back as a demon.

Castiel tells his story in his own words and confesses to some interesting choices.

Dean's worst nightmare comes true when a demon kidnaps Ben and Lisa in order to get to him. The brothers are forced to join forces with an unlikely ally to free them.

The wall comes down in Sam's head and all hell breaks loose. Dean and Bobby are, for once, at a total loss on how to help him and are forced to stand by and do nothing while Sam breaks. The battle for heaven comes to a head.

Castiel believes he is the new God and becomes obsessed with power. Sam, Dean, and Bobby try to find a way to stop him before he explodes with power, even if that means talking to Death himself.

Two Leviathans are impersonating Sam and Dean and going on a killing spree. Now, Sam and Dean are the most wanted criminals in the country.

Sam runs into Becky and they end up getting married. Dean finds it suspicious that Sam is falling for her and decides to investigate.

Lucifer is driving Sam into madness. Desperate to save him, Dean tries to find someone who can help. He finds Castiel with amnesia, instead.

To officially kill the leviathans, Sam and Dean need the blood of an Alpha. But Dick knows what the Winchesters are up to and sends his men after them.

Sam and Dean make a plan to storm Dick's company building and kill him once and for all, with help from Castiel and Meg. Providing Bobby doesn't get to Dick first.

Dean returns from Purgatory, one year after the fight with the Leviathans. After reuniting with Sam, they find out that Kevin escaped Crowley with another Word of God that may hold the key to closing the gates of Hell forever.

After saving Kevin's mother from demons, Sam, Dean, and Kevin go after the Word of God which is being auctioned off by Plutus, the god of greed.

Crowley has kidnapped Kevin and the rest of the prophets that are able to read the Word of God. Castiel mysteriously returns from Purgatory and helps Sam and Dean rescue Kevin.

Dean and Castiel try to rescue Samandriel from Crowley. Sam tries to decide whether or not he should continue hunting or be with Amelia.

Sam and Dean hunt down the angel tablet with assistance from Castiel and Meg.

The second task is to rescue an innocent soul from Hell and deliver it to Heaven.

Sam and Dean search for the Word's author, Metatron. Castiel tries to protect the angel tablet. Kevin tries to solve the third trial under Crowley's supervision.

Sam and Dean try to figure out how to cure a demon. Crowley starts killing victims that Sam and Dean have saved from previous jobs. Castiel and Metatron begin the trials to close the gates to Heaven.

Sam and Dean capture Crowley to finish the trials and close the gates of Hell. Castiel and Metatron continue the trials to close the gates of Heaven. Sam is left with a huge decision.

Sam and Dean reveal to Kevin that they have Crowley hostage, while Abaddon returns to hunt them all down.

Sam and Dean accidentally free Dorothy, who has been trapped in the bunker for years, who seeks their help in killing the wicked witch.

Dean and Castiel team up to find a Rit Zien, an angel healer, who is easing peoples' suffering by killing them. Sam and Kevin ask Crowley for help in finding a way to open the gates to Heaven.

Dean and Castiel ask Crowley for help in finding Gadreel and getting him out of Sam's body.

Sam and Castiel believe that they found a way to track Gadreel. Dean and Crowley team up to find the first blade, which is in the hands of the biblical Cain.

Sam and Dean assist Crowley in the search for the first blade.

Dean copes with the side effects of the Mark of Cain, as Sam investigates a series of violent murders related directly to Abaddon.

Abaddon makes a deal with Crowley to stop the Winchesters and recover the first blade. Castiel tries to bring Gadreel to his side in the war against Metatron.

The influence of the mark on Dean reaches new heights, as Metatron begins to reveal himself to humanity.

Dean is a demon and running amuck with Crowley while Sam tries to figure out what happened to his brother. Meanwhile, Castiel is dealing with his diminishing grace.

Crowley is worried about Dean getting out of control, giving him a target to feed the mark. Sam struggles to escape from Cole. Hannah tries to convince Metatron to give Castiel's grace back.

Sam continues to try to save Dean from the Mark of Cain. Realizing that Dean's antics are causing problems for him in hell, Crowley seeks help from a reluctant Castiel.

Sam and Dean discover a group of witches "gone wild" and they attempt to stop them.

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

Sam and Dean try to deal with the aftermath following the bloodbath. Castiel attempts to fix a struggling relationship with Claire, and Claire wants revenge on Dean for what he did to her friend.

Dean is mysteriously transformed into a teenager. He has to deal with teenage struggles all over again, along with being a hunter.

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

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

Castiel comes back and he and Sam check out a lead on the Mark of Cain. They decide to go to Bobby for help. Meanwhile Dean and Rowena meet up.

While investigating a strange murder, Sam and Dean discover the killer has the same tattoo as those from the Styne family; Castiel plays referee when Charlie and Rowena must work together; Crowley turns to an old enemy for help with Rowena.

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

Dean comes to a stunning decision that will alter his life -- as well as Sam's; Rowena and Crowley face off, putting Castiel in the middle.

Dean and Sam dealing with the aftermath of freeing the darkness on earth.

Jenna winds up in a dangerous situation and calls Dean for help, leaving Sam to deal with monsters on his own.

Sam and Dean try to help Castiel recover from Rowena's spell, while searching for Amara who has now grown into a young girl. Rowena tries to use her powers to protect herself from the Winchesters, while Crowley tries to use Amara for his personal gain.

Castiel seeks out Metatron's help to stop the Darkness. However, Metatron is pretty happy with his new life as a freelance videographer for the local news and isn't inclined to help the Winchesters or Castiel.

With Amara leaving a trail of bodies in her search for God, Sam enlists Crowley and Rowena to set up a meeting between him and Lucifer in the cage.

Now that he has Sam in the cage with him, Lucifer offers Sam a way out but it comes with a steep price. Dean and Castiel look into the angel smiting that might have killed Amara.

Sam and Dean convince Lucifer (unknowingly, thinking he's Castiel) to send them back in time to find a hand of God which could destroy Amara.

Sam and Dean attend a wrestling match to relive one of their fondest memories, but when a wrestler turns up dead, they suspect foul play.

Lucifer tries to assert himself into heaven; Crowley tells Sam and Dean they must take down Lucifer.

Sam and Dean face their biggest challenge yet. Rowena makes her move.

Chuck tries to lock Amara away for good but then faces some unexpected complications.

Dean comes face to face with his mother while Sam fights for his life after being shot by Toni.

Dean, Castiel and Mary have a lead on Sam and set out to rescue him. Dean is uncomfortable putting Mary in danger, but she insists on going. Meanwhile, Crowley is tipped off that Lucifer has taken over the body of rock star Vince Vicente.

When a crying baby leads to death in a mysterious abandoned house, Mary, Sam and Dean decide to investigate. Meanwhile, Castiel's hunt for Lucifer leads him, begrudgingly, to partner up with Crowley.

Lucifer realizes that as Vince Vincente, he can get his fans to do whatever he wants. Thrilled with this power, he arranges a VIP concert in order to kill them. Sam, Dean and Castiel enter the underbelly of the music industry to stop him.

Sam, Dean, Castiel, Crowley and Rowena band together to fight Lucifer when his search for power leads him to the White House.

Sam and Dean must find a way to escape from a government-run detention facility; in an effort to find her sons, Mary and Castiel seek assistance from a surprising source.

Mary asks Sam, Dean and Castiel for help on a case she's working, but neglects to mention the British Men of Letters are involved. When Mary is double crossed, everything is revealed.

A ghost from a merchant ship may be responsible for a murder at a museum; an angel tries to kill Kelly.

Sam and Dean investigate an attack by an invisible hellhound at a campsite. Meanwhile, two of Crowley's own personal demons uncover what he has been hiding. Elsewhere, Castiel gets a lead on Kelly Kline.

Sam and Dean get a lead on Kelly Kline's whereabouts. Mick drops by the bunker unexpectedly and decides to join the hunt.

Sam and Dean are alarmed when they learn hunters are being killed by suspicious "accidents" all over the country. They decide it is best to find Mary and make sure she's safe. Meanwhile, Toni is back in the states and she and Mary face off.

Lucifer battles Sam, Dean and Castiel for control of his unborn son.

Everything is on the line as the battle against God continues; a familiar face returns to join the fight.

Dean and Castiel ask Crowley for help in finding Gadreel and getting him out of Sam's body.

Sam and Dean assist Crowley in the search for the first blade.

Abaddon makes a deal with Crowley to stop the Winchesters and recover the first blade. Castiel tries to bring Gadreel to his side in the war against Metatron.

Crowley offers to help the brothers hunt down Pestilence and reclaim his ring, while Dean gets a lesson in trust when Sam's history with the Four Horsemen's demon `Stable Boy' is revealed.

Sam and Dean investigate an attack by an invisible hellhound at a campsite. Meanwhile, two of Crowley's own personal demons uncover what he has been hiding. Elsewhere, Castiel gets a lead on Kelly Kline.

Sam and Castiel believe that they found a way to track Gadreel. Dean and Crowley team up to find the first blade, which is in the hands of the biblical Cain.

Lucifer battles Sam, Dean and Castiel for control of his unborn son.

Sam and Dean attend a wrestling match to relive one of their fondest memories, but when a wrestler turns up dead, they suspect foul play.

Mary asks Sam, Dean and Castiel for help on a case she's working, but neglects to mention the British Men of Letters are involved. When Mary is double crossed, everything is revealed.

Jenna winds up in a dangerous situation and calls Dean for help, leaving Sam to deal with monsters on his own.