Russell T. Davies has said that this week’s villain is hard to describe; you’ve just gotta watch the episode to understand what’s going on. Well, friends, I’ve watched the episode several times and still couldn’t confidently tell you. In addition to building on some of the season’s now-familiar mysteries (snow, Susan, the supernatural), tonight’s Doctor-lite adventure leaves us with a lot of new questions that Ruby Sunday is quite literally dying to get the answers to. She...