The Leviathans are out. Castiel is gone.
With black oil spreading through the water, humans are turning into monsters.
While Sam battles Lucifer’s hallucinations, Dean fights a powerful Leviathan named Edgar.
Sheriff Jody discovers the terrifying truth at a hospital: possessed doctors are eating patients alive.
Meanwhile, an ancient god, Osiris, begins judging the guilty—and Dean is next in line.
The brothers are surrounded by monsters, madness, and myth. Can they survive?
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