"I suspect the 'something in common' might be you - well, a Doctor. Or something like that." The Doctor shrugged. "Maybe an interest in shagging you. Jack did mention one of the Masters he'd run into wanted to take him home for a threesome.
"Martha. Hmm. Lovely woman, medical student when I took her with me, in 2008. Was just one set of exams short of being a doctor, and she'll be a lovely one when she passes them. Was a lovely doctor once she passed the exams. Lovely, had a brilliant life, fantastic family."
He glanced at a coffee shop, and contemplated stopping in, as it looked the sort of place the Master would like. "The Master... I'll deal with him, one way or another. And if that means cleaning up a messy time-line, it means cleaning up a messy timeline. Though we don't actually know what happens if someone regenerates here."