"Did you hear me say that I didn’t like the Master and didn’t want him back? Well, I was lying. Actually I was delaying, cos I needed a couple of years to work out how to write him. Then the whole thing suddenly clicked - he’s insane! And I don’t mean that lightly; I don’t mean ha-ha barking mad; I mean genuinely, profoundly, clincally insane - a psycopath, or more probably a sociopath, and a high functioning one at that. As soon as I understood that, then I was dying to write him.“

Doctor Who: Sound of Drums

Russell explains: "The whole point of the third series has been about this woman who has learnt so much and is so devoted to the Doctor that she spends an entire year walking the Earth in order to save not just him but the whole world. The theme of this year has, I suppose, been unrequited love. I just love writing about it, cos I spend my life in a state of unrequited love. But you couldn't sustain that for two years. I only completely made up my mind about Martha departing in the second half of last year. I want to see that character grow up, which is the point of her making a break. There's so much further to go with her now. It'll be brilliant to see her as a much more indepedent woman."

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