We've seen Doctor Who's time-wimey take on "A Christmas Carol", and now it's time to look ahead to season six. Let's examine the new trailer and learn what's in store for the Doctor and his friends. Spoilers and speculation ahead!

Unlike last year's trailer, which included clips from as far ahead as episode nine, this trailer is mostly just the opening two-parter and assorted clips from the rest of the first half of season six. To the best of our knowledge, only the first four episodes have completed filming, while Matthew Graham's two-parter for episodes five and six is currently in the middle of shooting. As such, it's unlikely they would have any finished clips from those episodes available for this trailer.

But this trailer has some pretty amazing revelations about those early adventures - if this is how much they're cramming into just the first four episodes, it's hard to imagine what's in store for us in the final nine. So let's get to work...