The Doctor: What are you staring at exactly?
Jenny: You keep insisting you're not a soldier but look at you, drawing up strategies like a proper general.
The Doctor: No, I'm trying to stop the fighting.
Jenny: Isn't every soldier?
Jenny: And Time Lords, what are they for?
The Doctor: For? They're not for anything.
Jenny: So what do you do?
The Doctor: I travel. Through time and space.
Donna Noble: He saves worlds, rescues civilizations, defeats terrible creatures and runs a lot. Seriously, there's an outrageous amount of running involved.

"My name is Jenny, I’m the Doctor’s Daughter.
This is just the beginning of my story.
I’ve got the whole universe.
Planets to save, civilisations to rescue, creatures to defeat.
You’d better hold on tight, because we’ve got an awful lot of running to do.
And you’d never believe who with."