WARNING: The synopsis contains mild spoilers some may want to avoid.
Where is the Doctor? 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?The Magician's Apprentice airs on Saturday 19th September, with the UK time to be confirmed next week. The episode is provisionally scheduled for 7.45pm.
As past deeds come back to haunt him, old enemies will come face-to-face, and for the Doctor and Clara survival seems impossible.