“Then I spent a long time thinking about body-swapping - so the Master becomes the Doctor and vice versa, which would give us Evil David Tennant. That would be fantastic, especially in his swansong.”
- Russell T. Davies, The Writer’s TaleWHY was I not previously aware that RTD's original plan for End of Time involved Master-Doctor bodyswapping? Considering Tennant!Master has been right up near the top of the "fandom crack theories I wish we'd been able to see" wishlist for
ages and I might have recently written a few thousand words of crappy porn with Ten and Martha and roleplaying as the Master which sprang solely from the mental image of Tennant getting to say "I am the Master, and you will obey me." And SIMM!DOCTOR and the two of them getting to play off each other and it would've been the best crack ever, far better than the six billion Masters. And the sheer POSSIBILITIES of the Master getting to impersonate the Doctor! Imagine the episode starts, the Doctor is taking control of some messy situation as normal, and then he goes and does something ludicrously evil and the title credits roll. Fucking awesome pre-theme-song cliffhanger, especially right after Waters of Mars. And at some point "the Doctor" would call UNIT up and ask them to send over Martha Jones to help him deal with "the Master," and we'd get ten or fifteen very tense minutes of her playing along before she bitchslaps him at the climactic moment and is all "the Sontarans tried to replace me with a clone once, do you think I can't tell you're not the Doctor?" Not to mention the slash would be
glorious and I might've gone a bit slack-jawed when I tried to imagine the EoT bondage chair scenes with the actors swapped.
And then I flailed about this with
filia_belialis and one of our tangents led to her instructing me to go watch Time Monster. Which I just finished watching. And oh, Delgado!Master, you GQ motherfucker, if it's wrong of me to secretly root for you then I don't want to be right. Even when you are doing stupid things like summoning chronovores. So goddamn classy, even when he's sending Jo and the Doctor to their deaths, and I love how laid-back Three and Delgado are about each other. "Oh yes, it must be my archenemy, of course he's up to something. I guess I'll have to go thwart him soon. More tea?"
(Am I alone in thinking that Tennant!Master would've been very, very Delgado? Only more crazy intensity and less GQMF. Not that they resemble each other, exactly, more that they're both capable of being all eyebrows and bared lower teeth and stagey classical expressiveness.)
Other things that have resulted from conversations with
filia_belialis: it is now my headcanon that any time the Doctor mutters about humans and their silly linear notions of time and space, it is because Time Lords use
elliptical geometry instead of Euclidean. It also explains the circular writing system. And the timey-wimey ball. Time isn't a linear progression of events any more than a cornfield in Iowa is a flat plane; the plain is part of a globe, the timeline is part of the timey-wimey ball, and the timey-wimey ball is more like a trampoline that sags under the weight of important events to make temporal gravity wells, fixed points holding other scraps of history in orbit around them. At least, until the Doctor Who writers need new rules about changing history.
...also headcanon that Academy!Koschei once built a tiny paradox machine powered by some professor's desk toy (the Time Lord equivalent of a plasma ball?), overcame Theta Sigma's initial reservations about it by using it to solve the halting problem and wowing him with Rule of Cool, and the two of them used it for increasingly ridiculous things until it overloaded its feeble power source, exploded, and unleashed a Reaper in the middle of a physics lab.