Episode Description: Beware, spoilers! To read - hover over the text.
Trying to get back to your post as king of Hell, Crowley asks for Dean's help to find the "First Blade", the only sword that can kill Abaddon. Dean reluctantly agrees. Sam returned to the bunker to Castiel. Castiel offers to remove grace and sharpen Gabriela. The only problem is that it will lead to the irreversible disappearance of Sam.