Steven Moffat interview
In a phone call to Russell T. Davis, he told Davis that he was going to bring Simm's Master back. They concocted a whole scheme that he'd hand the show over to Chris Chibnall with the cliffhanger of Missy telling The Doctor and The Master that she was pregnant. But he decided not to do that. (it's hard to tell if Moffat is joking or not) https://www.youtube.com/watch?v=Ac7pl1lI8FU&feature=youtu.be
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