Since a few people mentioned the 13th doctor, has anyone considered the possibility of ever reusing a previous doctor?kind of opens a door.since we know John is going to be back as the master a timelord regenerating into a previous form is about to be cannon right?
Do we know for sure that Missy is regenerating back into John? I just assumed this was a Two Master story like the 50th anniversary being a Three Doctor Story. So we see John's Master before he regenerates into Missy interacting with his regrenerated self.
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Bill continues to be an excellent companion this episode, I really like her actually.