Supernatural (Season 11)

  In this season, Sam and Dean deal with the release of Amara/The Darkness, after Rowena's spell removed the Mark of Cain from Dean's arm. Soon, they find out that Dean and Amara are, somehow, bonded. Meanwhile, a mysterious black fog is killing people in a nearby town. When Dean and Sam attempt to save those people, they meet Deputy Jenna Nickerson, who's taking care of a newborn baby girl whose father was infected and eventually died. The baby is taken to Jenna's grandmother's house, where the baby begins levitating toys. This prompts the old lady to call an exorcist, and Jenna to call Dean. When Dean arrives, he finds out the exorcist is Crowley, who found out the baby is The Darkness, and eventually flees taking her with him. Meanwhile, Sam begins to have visions, that he claims to be sent by God.

While Crowley's taking care of Amara, feeding her with souls, the brothers are, alongside Castiel, trying to find a way to kill The Darkness. In order to find out more about Amara, Castiel asks Metatron for help, and he says that in order to create the world, God had to sacrifice His sister, The Darkness. At this point, Sam is having visions from the cage, where Michael and Lucifer are trapped.

To face the most dangerous creature they've crossed paths with so far, the brothers, alongside Crowley, Castiel and Rowena, go to hell in order to ask for Lucifer's help. Lucifer claims he's the only one that can beat Amara, but in order to do so, he needs to possess Sam's body. Also he tells Sam that the release of The Darkness weakened The Cage and he's been the one sending Sam's visions and that God was never helping them. When Sam refuses, Lucifer tries to kill Dean, Sam, and Castiel, but Rowena's spell seems to have sent him away. Later, it's revealed that Castiel said "yes" at the last second, and that Lucifer is now possessing his body. Then, Lucifer takes control of Hell and kills Rowena.

After a while of being fooled by Lucifer, the brothers find out that Castiel is no longer among them, and that it was Lucifer who was in control. Meanwhile, they're seeking the Hand of God, a couple of artifacts that were touched by God Himself, and that can unleash a great amount of power, and it's believed to be able to kill the Darkness.

When nothing works, Amara claims that God must appear Himself to see her destroying everything He created and loves. Then, she decides to draw out God by torturing an archangel, making Lucifer/Castiel scream in agony. Meanwhile, Chuck returns and reveals himself to Metatron, telling him He is God. Then, He reveals Himself to The Winchesters and they all decide to seal Amara. Rowena, who had cast a spell that made her immortal, helps them with a spell, while Crowley and Lucifer use the demons and the angels to make a combined attack against Amara. When Chuck tried to seal Amara, she resisted, stopping the Winchesters, apparently killing Lucifer and gravely wounding Chuck. Amara warns that Chuck is not dead yet because he is going to watch her destroy everything ever created.

After finding out that Lucifer's gone and that Castiel is back, they find a fatally injured Chuck. As a result of Chuck's injuries, the sun is now dying and the world along with it. Realizing that the only chance for the world to survive is to kill the Darkness along with Chuck, the Winchesters begin gathering ghosts to create a bomb to destroy the Darkness. With the help of Billie the Reaper, they are able to get the needed souls which are inserted into Dean. Chuck sends Dean to Amara who has started to regret her actions and Dean convinces Amara that revenge is not worth it. Amara and Chuck reconcile and Amara heals Chuck of the damage she did to him. The two then leave the Earth, but not before Amara tells Dean she is going to give him what he wants most for helping her. At the bunker, Castiel is banished by a woman who identifies herself as Lady Antonia Bevell of the London chapter of the Men of Letters. Antonia tells Sam the Men of Letters have sent her to bring Sam in for punishment for his actions and fires her gun, apparently at Sam as he tries to talk her down. Making his way through the woods, Dean finds his resurrected mother.