She had a recurring role in series 8 - 10 of "Doctor Who" as a character called Missy. Her true identity was later revealed in the series' two-part finale "Dark Water" / "Death in Heaven" as a female incarnation of the Master, the Doctor's longstanding nemesis. Gomez reprised the role in the opening two-part story of the ninth series "The Magician's Apprentice" / "The Witch's Familiar" and again in the show's tenth series, which began broadcasting in April 2017. In May 2017, Gomez stated that it would be her last series in the role.