Sam (Jared Padalecki) and Dean (Jensen Ackles) press their luck in a winner-takes-all game of pool. Meanwhile, Castiel (Misha Collins) hunts down a would-be murderer, but not for reasons one might think.
Why do they call this place The Empty? It's full. It's full of sorrow and despair playing over and over again of angels and demons dreaming about their regrets. Forever.