The BBC has released the first episode of Doctor Who Series 9 "The Magician's Apprentice" on YouTube, which can be watched above.
Doctor Who airs Saturdays on BBCA.
You can also check out the preview for the next episode, "The Witch's Familiar."
The Magician's Apprentice Synopsis:
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?
As past deeds come back to haunt him, old enemies will come face-to-face, and for the Doctor and Clara survival seems impossible.