The BBC have released a prologue for the series 9 opening episode, The Magician's Apprentice, featuring the Sisterhood of Karn and The Doctor.

Please note, this is not the same as the prequel released by BBC Worldwide in America called The Doctor's Meditation. This works out as a sort of prequel to that prequel, which isn't really a prequel at all as this fits in part way through the episode. Got that?