The BBC Media Centre have issued the synopsis for the first episode of the upcoming ninth series of Doctor Who:
THE MAGICIAN'S APPRENTICE - by Steven Moffat
When the skies of Earth are frozen by a mysterious alien force, Clara needs her friend. But where is the Doctor, and what is he hiding from? As past deeds come back to haunt him, old enemies will come face-to-face, and for the Doctor and Clara survival seems impossible.
The Magician's Apprentice will broadcast on Saturday 19th September at 7:40pm on BBC One and BBC One HD.