The episode will last for 45 minutes, and will conclude at 9pm. Dark Water, the first of a two-part finale written by head writer Steven Moffat, will air on the same day on BBC America at 9/8C.
In the mysterious world of the Nethersphere, plans have been drawn up.
Missy is about to come face to face with the Doctor, and an impossible choice is looming.
“Death is not an end” promises the sinister organisation known only as 3W – but, as the Doctor and Clara discover, you might wish it was.