"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.