Throw me to a horde of White Walkers because after the pure joy of last week's "The Book of the Stranger," last night's Game of Thrones was sad as f*ck. "The Door," the first episode of the series directed by Jack Bender (who also directed the best episode of Lost, "The Constant," which involved similar time travel mindf*ckery), was another excellent episode in an increasingly exciting season, even as it left all its characters on perilously unsure footing. If you haven't watched last night's episode yet, don't read ahead. For everyone else, I'll hold the door.