“The Time Lord has entered the trap.” Man, this Doctor Who teaser sure is ominous! (Prepare ye Tumblrs while there’s still time, Whovians.) This year’s Christmas special, “The Time of the Doctor,” will mark the end of the Matt Smith era and inaugurate Peter Capaldi as the new Doctor, so perhaps that impending doom feeling is appropriate? That’s not a knock on Capaldi’s potential — it’s just sad any time a Time Lord goes off into the great beyond. Exterminate, exterminate, etc.