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

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

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Sam and Dean's road trip to fight monsters and demons is chronicled entirely from the Impala's perspective.

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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.

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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.

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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.

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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.

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In the midst of battling werewolves Sam gets shot then strangled and goes into shock. Dean, thinking Sam is actually dead, takes drastic measures to talk to a reaper in order to save his brother.

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

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Amara unleashes a dark fog on a small town that causes everyone to go mad. Dean and Sam realize this is a stronger version of the original black vein virus Amara previously unleashed.

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

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

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

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