[Just human. The corners of his lips twitch as he shoves down the thought. She doesn't know, can't know. Didn't live through the year of hell. And for that, Jack will always be thankful. Rose was long out of reach by the time the Master came onto the scene.]

Being human doesn't make him any less dangerous, Rose. Not this one. He's insane, and he's going to be intent on hurting the Doctor, by hurting everything and everyone the Doctor cares for. That's going to make you a primary target.

He might introduce himself as Harold Saxon; that's the name he used on Earth, to get around without the Doctor catching wind of him.