[fidgeting a little; it isn't her favourite topic] Well, there's the Doctor, right? Jack's Doctor. He's a Time Lord - basically, an alien bloke with two hearts who travels through time and space. The Master is the only other Time Lord left, 'cept he died in most universes, thank God. [she runs a hand through her hair] I...don't know much of anything about the world you come from, but I do know that he took over for a year - you don't remember it 'cos the paradox was broken and the year was reversed, right before Lucy shot him.