Supernatural, O Brother Where Art Thou?

Sam and Dean face the Darkness that has been unleashed. Meanwhile, Castiel deals with the effects of Rowena's spell and recalls his brutal battle with Crowley.

Dean helps Jenna, the nurse he met after the Darkness fell, get back home safely, but she soon falls into dangerous hands. Meanwhile, Sam deals with a town infected by a mysterious and deadly gas that is turning the locals into monsters.

Rowena tries to consolidate her power to protect herself from the Winchesters, while Sam and Dean search for a missing baby connected to the Darkness. Meanwhile, Castiel struggles to heal.

Seen entirely from the point of view of the Impala, Sam and Dean go on a road trip to fight monsters and demons.

Sam and Dean investigate a series of murders at a local B&B that also happens to be Lizzie Borden's old home. When a man tells them he saw a little girl around the B&B around the time of the murders, the brothers realise Amara may be responsible.

Castiel seeks 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.

Sheriff Donna calls Sam and Dean for help after a horrific murder with supernatural elements occurs in her town. Meanwhile, Sam continues to have visions and asks God for help, which frustrates Dean.

Sam is shocked when his imaginary childhood friend, Sully, makes an unexpected appearance. Sam tries to understand why he is seeing Sully now. Even more surprising, Dean can see him too.

Amara unleashes her power on local townspeople and issues a shocking challenge. Dean tries to better understand the hold Amara has on him, while Sam and Crowley come up with a plan that could have disastrous consequences.

Lucifer offers Sam a way out of the cage, but it comes with a steep price. Meanwhile, Dean and Castiel look into the angel smiting that could have killed Amara.

Sam and Dean investigate a case in which people suffer violent deaths after hearing a mysterious song.

Claire believes recent murders in town are supernatural and asks Sam and Dean to investigate. Sheriff Mills tells the guys that Claire has been getting into trouble lately and has been attacking people and accusing them of being monsters.

Sam and Dean investigate murders on Valentine's Day and discover they are dealing with an ancient curse. Once kissed by the curse, the person is marked to die.

Dean, who hopes to find a weapon powerful enough to defeat Amara, convinces Lucifer to send him back in time to 1944 to the ill-fated submarine mission that sunk the Hand of God.

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.

A dangerous creature is accidentally released into an old house where it attacks a mother and her child, leaving them both in a coma. Sam and Dean learn that Bobby and Rufus once tracked the same entity.

When Sam gets shot while rescuing two victims from a pair of werewolves, Dean must get everyone out and try to evade the pack that is pursuing them.

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

Sam and Dean go to a small town in Colorado to meet two hunters who have a personal vendetta against monsters that appear once in a generation and cause mysterious disappearances.

Amara causes a small town to go mad when she places a dark fog upon it. Sam, Dean and the sheriff try to protect the town, but the old remedy fails.

Concerned for Castiel, Dean and Sam devise a plan to rescue Lucifer from Amara's clutches.

Sam and Dean come up against the biggest challenge they have ever faced. Rowena decides to make her move.

God's decision about Amara has direct repercussions on Sam and Dean.