"The Zygon Inversion" is the eighth episode of the ninth series of the British science fiction television series Doctor Who. It was first broadcast on BBC One on 7 November 2015, and was written by Peter Harness and Steven Moffat and directed by Daniel Nettheim. The episode is the second of a two-parter, the first being "The Zygon Invasion", which aired on 31 October 2015.