10 Quintessential Doctor Who Moments From The 12th Doctor
7. The Doctor Meets "Missy"
The Doctor’s oldest friend and greatest nemesis has always been a man known simply as the Master. For years and years they clashed, with The Doctor almost always coming out on top. The Master’s most recent appearance was an epic showdown that resulted in the demise of both him and the fan-favorite 10th Doctor.
When a Time Lord “dies” they often regenerate, taking on a completely new appearance. After that epic showdown the Master disappeared for a number of years, only to reappear in series eight, regenerated as a woman. She now goes by the Mistress or “Missy” for short.
While The Doctor and Mistress still have an antithetical relationship, the dynamic has certainly changed now that they are each a member of the opposite sex. Strange, but good.