"Dark Water" is the eleventh episode of the eighth series of the British science fiction television programme Doctor Who. The episode was written by showrunner and head writer Steven Moffat and is the first of a two-part story; the concluding episode is "Death in Heaven", the finale of the eighth series. It was first broadcast on BBC One on 1 November 2014. In the episode, Danny Pink (Samuel Anderson) is killed, and finds himself in 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 "Death in Heaven" is the twelfth and final episode of the eighth series of the British science fiction television programme Doctor Who. It is the second episode of a two-part story involving the return of the Cybermen and the Master in the form of 'Missy', the first part being "Dark Water", written by Steven Moffat and directed by Rachel Talalay. The episode stars Peter Capaldi, Jenna Coleman, Samuel Anderson, Michelle Gomez, Chris Addison, Jemma Redgrave, and Ingrid Oliver. The episode received mostly positive reviews, with critics praising its writing, direction, and acting. With Peter Capaldi, Jenna Coleman, Samuel Anderson, and Michelle Gomez receiving widespread acclaim for their performances, Gomez was consistently highly praised in reviews, with many calling her a highlight of the eighth series