Dark Water

S8, E11: Dark Water

Available on iTunes, BBC iPlayer
In the mysterious world of the Nethersphere, plans have been drawn. 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 organization known only as 3W - but, as the Doctor and Clara discover, you might wish it was.
Starring Samuel Anderson, Michelle Gomez, Joan Blackham