<P> Quitting hunting and moving in with an ex-girlfriend Lisa, Dean begins to move onto a normal life but is thrust back into hunting when attacked by a Djinn and mysteriously saved by Sam . Shocked to learn of his brother and maternal grandfather's resurrections, Dean is placed even more on edge when Sam acts cold, ruthlessly and lets Dean temporarily turn into a vampire . Later learning from Castiel that Sam is lacking a soul, Dean sets out to fix his brother . Getting Sam's soul back through Death, the brothers begin to unravel a conspiracy involving Crowley and Castiel . Defeating Eve, the mother of all monsters, Dean cuts ties with Lisa and learns Castiel to have taken Purgatory's souls to become the most powerful angel alive . Requesting Death's help, Dean is unable to get Castiel to return the souls of Purgatory in time and the Leviathans break free and begin an effort to take over the Earth . After their father figure Bobby is killed by Dick Roman, the Leviathan leader, they gain an ally through Kevin Tran, a new prophet . With the Word of God, Dean and Castiel kill Roman but are themselves killed in the subsequent explosion and dragged to Purgatory . </P> <P> Surviving in Purgatory with the aid of the vampire Benny and Castiel, Dean and Benny eventually escape . Full of guilt at being unable to rescue Cas, Dean is angered to learn that Sam did not even search for him . Reuniting with Kevin, they find another Word of God that details trials able to close the gates of Hell . Coming to terms with what he did in Purgatory, Dean aids Sam in completing the trials, and along the way they encounter the rogue angel Metatron and the Knight of Hell Abaddon . During this time the brothers are also given the Men of Letters bunker as a headquarters . Joyed that Castiel was able to escape Purgatory as well, Dean is horrified to learn his best friend to have been programmed by the angel Naomi to try to kill him . Capturing Crowley, Dean stops Sam from completing the trials when he learns it will kill his brother . When they begin to head to the hospital, Sam lapses into a coma just as the angels begin to fall down to Earth . Praying for help, Dean learns Metatron to have turned Castiel human and caused the fall . Aided by an angel named Ezekiel, Dean allows him to possess Sam if it means saving his brother . With Ezekiel in Sam, however, Dean is unable to get any help from Castiel and begins to try to find a way to handle Abaddon . Joining up with Metatron, Ezekiel reveals himself to actually be the angel Gadreel and overpowers Dean, preventing him from saving Kevin . Turning to Crowley for help, Dean manages to purge Gadreel from Sam at the cost of their relationship . Growing desperate to defeat Abaddon, Crowley manipulates Dean into accepting the Mark of Cain and aids him in locating the First Blade . Mending his bond with Sam, Dean kills Abaddon and nearly slaughters Gadreel . When finally confronting Metatron, Dean is fatally stabbed and once again dies . His body brought back to the bunker, Dean's reawakens a demon and leaves with Crowley . </P> <P> Enjoying his time as a demon and killing several of Abaddon's loyalists, Dean eventually kills an innocent man called Lester Morris and uses his newfound demon powers to confirm what Crowley told him about Sam . Eventually confronting his brother, Dean is pulled into a fight by a soldier named Cole, allowing Sam to use holy water to imprison his brother . Using the demon cure process to try to turn his brother back, Sam lets his guard down as Dean escapes . With the help of Castiel, however, Dean is cured, but still remains an enhanced human with the Mark of Cain . After eventually growing more and more powerful while losing control, Dean learns from Cain, before killing his ancestor, that there is no viable cure . Death later confirms this by revealing that removing the Mark would unleash the Darkness and offers to remove Dean from society on the condition that he kill Sam . Although he initially agrees, Dean relents and kills Death instead . However, due to Sam's earlier machinations, the Mark is removed and the Darkness is unleashed regardless . </P> <P> With the Darkness unleashed, Dean and Sam set out to try to find the Darkness, but are shaken to learn that the entity they are hunting is essentially God's sister, who was' sacrificed' so that he could create the world . Manifesting as a woman who comes to call herself Amara, Dean finds himself unable to kill her due to a twisted attraction, but matters become even more complicated when Castiel consents to act the vessel for Lucifer when he becomes convinced that only an archangel has any chance against Amara . This strategy fails - speculated to be due to Lucifer's status as a fallen archangel - but the Winchesters are eventually contacted by the true God, now revealed to be Chuck Surely, the author who wrote the Winchester Gospels, who is able to make peace with Amara and depart . Dean is shocked when he is reunited with his mother, who is brought back to life by Amara as thanks for Dean's actions, but the Winchesters find themselves facing human and supernatural threats when the British branch of the Men of Letters attack the Winchesters to try to take control of America's hunters and Lucifer is left on the run trying to find a new vessel . Lucifer eventually takes the President of the United States as a vessel, but the Winchesters are able to banish him from this host . </P>

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