"Into the Mystic" was a decent monster-of-the-week chapter that touched upon all the ongoing arcs of the year. Dean's connection to Amara, Sam's guilt/restlessness, and Cas - well - now being Satan. Plus, it had an old woman hitting on Dean. Oh, and Dean labeling Viagra theft as a "dick move." Which cuts things bit close, censorship-wise, regarding how a character's allowed to say dick on network TV.