Over nearly six decades, Doctor Who has introduced no shortage of fantastic villains. From the cold-blooded Daleks and their leader Davros to the recent portrayal of the horrific Swarm, the Doctor's enemies span all of time and space. Many are whole populations of hostile species, but every once in a while, an individual comes along who challenges the Doctor with a unique capacity for evil schemes. Of these individuals, the oldest recurring figure is the Master, a time lord whose brilliance rivals the Doctor's own.
Like the Doctor themself, the Master has taken many forms over the years, played by different actors across several regenerations. They first appeared played by Roger Delgado in 1971, alongside the Third Doctor (Jon Pertwee). Since then, the Master has been defeated several times, only to reappear in a regenerated form. The most memorable of the Master's reincarnations, though, went by a different name: Missy, short for «Mistress,» which she decided was more fitting after regenerating into a woman. Played by Michelle Gomez, Missy was a recurring character on the show between 2014 and 2017. In that time, she ultimately redefined and re-affirmed the Master's role in the story and relationship to the Doctor.
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Ever since their introduction, the Master's main purpose has been to serve as a foil to the Doctor. The two have a surprising amount in common: both are something of renegades, Time Lords who weren't content with the rules and regulations of Gallifreyan society and thus ran off to carve their own paths in space and time. Both are among the most brilliant minds that their planet has produced, and both are willing to go to great lengths for what they perceive to
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