The BBC has released a new trailer for this year’s Doctor Who Christmas Special, “Twice Upon A Time” which airs on 25 December at 5.30pm. This one hammers home in no uncertain terms that this is a regeneration story, though don’t assume from the shot above that the regeneration necessarily takes place in the TARDIS – since the story features the Twelfth Doctor trying his darnedest not to regenerate that could be a false start. Or maybe it’s not. We’ll all know in just over a fortnight. And isn’t David Bradley looking great as the First Doctor in the new footage?