The BBC has released another set of new images from this year’s Doctor Who Christmas special, featuring the first look at guest star Orla Brady.

Fringe actress Brady is playing Tasha Lem in the episode, described as “someone from the Doctor’s past”.

Matt Smith’s final episode as the Doctor, ‘The Time Of The Doctor’, airs at 7.30pm on Wednesday 25 December on BBC One and sees the Time Lord and Clara learn what an enigmatic signal means for his own fate and that of the universe.

> Find out everything we know so far about the Christmas special in our news summary.

> Buy the 50th anniversary special on DVD on Amazon.

> Buy the 50th anniversary special on Blu-ray on Amazon.

Watch the 50th anniversary trailer…

Who do you think Orla Brady is playing? Let us know below…