In addition a new image for the episode has been released, featuring Peter Capaldi as the Doctor, Jenna Coleman as Clara and Nick Frost as Santa Claus, plus Dan Starkey as Ian and Nathan McMullen as Wolf, two of Santa's helpers as seen in the recent preview shown on this year's Children in Need.
The BBC Media Centre have released details on the BBC Christmas line up, which includes a brief synopsis for the episode:
The Doctor and Clara face their Last Christmas. Trapped on an arctic base and under attack from terrifying creatures, who are you going to call? Santa Claus!