David – aka John Doe – must choose between staying with Kathryn or leaving her to be with Mary Margaret, with whom he’s fallen deeply, and inexplicably, in love; and…

Barry is thrilled when Oliver, Felicity and Diggle come to Central City to investigate a case involving a deadly boomerang.

Sam and Dean track down the missing Crowley and discover that he’s now thoroughly addicted to human blood. Once they get him sober, the brothers go seeking the First Blade…