"Dark Water" is the eleventh episode of the eighth series of the British science fiction television programme Doctor Who. It was first broadcast on BBC One on 1 November 2014. The episode was written by showrunner and head writer Steven Moffat and was directed by Rachel Talalay. It is the first of a two-part story; the concluding episode "Death in Heaven", the finale of the eighth series, aired on 8 November. In the episode, Danny Pink (Samuel Anderson) is killed, and finds himself in an afterlife called the Nethersphere. As the Doctor (Peter Capaldi) and his companion Clara Oswald (Jenna Coleman) try to find Danny, they find themselves in a facility that accommodates Cybermen, run by recurring character Missy (Michelle Gomez). In the episode's climax, Missy reveals her true identity as a female incarnation of the Doctor's arch-enemy The Master, last seen in the 2009–10 serial "The End of Time". The episode received widespread critical acclaim, with the performances of Capaldi, Gomez, Coleman and Anderson being praised. Critics praised the horror strand of the episode, the maturity level, and the darker, more mature and morbid themes. Plot Clara phones Danny, ready to admit the full truth of her travelling with the Twelfth Doctor and that she sincerely loves Danny. Danny is killed by a passing car midway through the call. Visibly upset, Clara schemes to use a hypnotic patch on the Doctor to blackmail him into saving Danny. The Doctor eventually reveals that the patch did not work on him; instead, he had used it on Clara to learn why she was upset and to see how far she was willing to go. He offers—as a friend, despite her betrayal of him—to see if they can locate Danny in the afterlife. Clara focuses on Danny's location with the TARDIS' telepathic interface. The Doctor and Clara arrive at a mausoleum called the Institute, which holds several tanks of human skeletons submerged in a substance called dark water; the dark water hides the exoskeletons that support the skeletons. They are greeted by Missy, who says she is a welcome droid. The scientist Dr Chang explains to them that 3W was founded to protect the dead after voices heard within white noise broadcast signals suggested the dead are aware of their bodies being cremated. During all of this, Danny is greeted by Seb in an apparent afterlife called the Nethersphere. Seb helps Danny