Sorry to disappoint everyone but 9 will be male. I did have MR as a female doctor in "Silk And Steel" but never got round to finishing it. There was "Blackadder Back and Forth" in 1999 which she reprised Elizabeth I so that would have precluded her from this. I hope that when 9 is revealed it will be a surprise
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The Alt-Doctor's eyes glow a furious red.
"Run" shouts the Doctor. He and Mary bolt for the TARDIS. The Alt-Doctor fires a beam of pure energy at the TARDIS which dematerialises in nick of time.
On the TARDIS the Doctor is frantically manipulating the controls to go anywhere but every co-ordinate he tries fails. Its as if the arrival of the AD has caused time and space to start collapsing in on itself.
Back on Earth the AD moves away slowly through the crowds who fail to notice her attire.
On the TARDIS the Doctor is recovering his composure but the mood is tense.
Mary says " I don't understand, how can she be you, how can she be so evil?
The Doctor turns and says:
"Every world, every time, every decision has an opposite, a doppelgänger. Our universe isn't the only one. Every choice we make is mirrored elsewhere, every event has its alternative conclusion. You could have let me die in 1867 but you didn't because of your compassion. I could have killed the Master but I didn't because of my compassion. She has no compassion. Her family was killed, her world destroyed and it was because of me"
"It wasn't because of you. You can't be responsible for actions in other universes. You're only responsible for what you do here just like I was responsible for helping you in Plymouth. It's not your fault. You had to stop Rassillion from destroying Gallifrey and Camelot and in this universe, our universe you did it. You did nothing wrong"
"But she's here in this universe and that is wrong. Time and space and reality, any reality are balanced, balanced in ways no-one can understand, not even time-lords and when that balance is gone the effects can be horrific. I know she's scarred and hurting but I have to stop her"
"How can you do that?"
"I have to kill her"