This Week's TV: Doctor Who does Christmas and Narnia!

Doctor Who returns this weekend with an extra-long holiday special — and we've got three brand new clips! Also, Terra Nova and American Horror Story are both having their season finales. Which do you think will be more demented? But there's also something called Viking Apocalypse, and a TV show about superhero-themed… » 12/19/11 9:00am 12/19/11 9:00am