In the show’s seventh season, their hunt for the dreaded Leviathans – monstrous creatures escaped from Purgatory – has cost them dearly. Claiming the life of their best friend and father-figure, Bobby Singer, and shattering their protector, the fallen angel Castiel, Sam and Dean’s battle to somehow defeat the age-old Leviathan threat will take everything they’ve got. As dawn arrives after their endless struggle and sacrifice to defeat the world’s evils, they know that, come nightfall, something otherworldly – something supernatural – will claw its way out of the shadows, demanding their attention.