Synopsis

Desperate, Crowley seeks out Dean’s assistance in finding the First Blade, the sole instrument capable of vanquishing Abaddon. Their pursuit unexpectedly leads them to the figure of Cain, a name steeped in biblical lore. Separately, Sam turns to Castiel for aid, needing his power to draw the last vestiges of angel grace from his own body – a necessary step to track the elusive Gadreel.