I actually haven't seen any of Season Three, so I don't know anything about it. I really need to get on that, I guess.
ellen_fremedon will actually know better than I; her knowledge of the original series is nearly encyclopedic. But I think there's only the one that the Third Doctor faced (Delgado?), and the burned-out hulk from "The Deadly Assassin" and "The Keeper of Traken" who becomes the--
You know, if I learned how to count, this would be easier. The burned-out hulk becomes the fourteenth Master, because he's the first Master post-the usual slate of regenerations (12 regenerations plus an original incarnation=13). So then the one in the movie is the Fifteenth Master.
Regardless that would still leave the present one as the fifth we know. There may be a pre-Delgado Master that I'm not remembering or never knew, or you may be right that there's one we just never met. (Or maybe there's a semi-canonical one we meet only in the novels.)
no subject
You know, if I learned how to count, this would be easier. The burned-out hulk becomes the fourteenth Master, because he's the first Master post-the usual slate of regenerations (12 regenerations plus an original incarnation=13). So then the one in the movie is the Fifteenth Master.
Regardless that would still leave the present one as the fifth we know. There may be a pre-Delgado Master that I'm not remembering or never knew, or you may be right that there's one we just never met. (Or maybe there's a semi-canonical one we meet only in the novels.)