For several years there’s been a vocal contingent calling, often rather loudly, for a female Doctor. The only reason people are even able to demand such a development is because it could in theory occur, given how Time Lord physiology appears to operate (really, on no other TV series could one insist that the sex of the lead character needs to change). But just because you can do something, doesn’t mean that you must; there has to be a strong narrative reason behind such a radical shift. Within the series, there’d previously been only one confirmation that a Time Lord could change sex, and that was in “The Doctor’s Wife,” when the Doctor offhandedly referenced a Time Lord named the Corsair, who at some point was a woman. That was a big moment, but this development just dwarfs it.
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