Merry Christmas, again! For the second week in a row, we’ve got a very special holiday episode. This time, it’s the series 2 Christmas special, “The Christmas Invasion”! It’s the first Tenth Doctor episode, and he’s got a lot to learn about himself, once he’s done snoozing. Meanwhile, Earth is being attacked by mostly-irrelevant Santabots and mainly the Sycorax. How will Harriet Jones get us out of this one? She’s the prime minister, by the way!