The episode will last 50 minutes, and finishes at 8.35pm. The Witch's Familiar, penned by head writer Steven Moffat, will air on the same day on BBC America at 9/8C.
Trapped and alone in a terrifying Dalek city, the Doctor is at the heart of an evil Empire: no sonic, no TARDIS, nobody to help. With his greatest temptation before him, can the Doctor resist? And will there be mercy?[Source: BBC]