10x10 The Hunter Games

THE AFTERMATH — After the massacre at the ranch, Dean, Sam, and Castiel double their efforts to find a cure for the Mark of Cain but there is nothing in the lore that can help them. Desperate, Castiel comes up with an idea that Sam deems the “single worst idea I’ve ever heard.” Meanwhile, Rowena (guest star Ruth Connell) continues to plot against Crowley, and Castiel tries to mend his relationship with Claire (guest star Kathryn Love Newton) who is plotting revenge against Dean for killing her friend.