Jack Harkness (about a soldier): Trust me, you're not his type. I'll distract him. Don't wait up.
Doctor: Relax. He's a 51st century guy. He's just a bit more flexible when it comes to dancing.
Rose Tyler: How flexible?
Doctor: By his time, you lot are spread out across half the galaxy.
Rose Tyler: Meaning?
Doctor: So many species, so little time.
Rose Tyler: What, that's what we do when we get out there? That's our mission? We seek new life and... and...
Rose Tyler: What? Are you telling me you do dance?
Doctor: 900 years old, me. I've been around a bit. I think you can assume at some point I've danced.
Rose Tyler: You?
Rose Tyler: Doesn't the universe implode or something if you dance?
Doctor: Well, I've got the moves but I wouldn't want to boast.
Doctor: Can you sense it?
Jack Harkness: Sense what?
Doctor: Coming out of the walls. Can you feel it? Funny little human brains. How do you get around in those things?
Rose Tyler: When he's stressed, he likes to insult species.
Doctor: Rose, I'm thinking!
Rose Tyler: He cuts himself shaving. He does half an hour on life-forms he's cleverer than.
Doctor: Sonic blaster, 51st century. Weapon factories of Villengard?
Jack Harkness: You've been to the factories?
Jack Harkness: They're gone now, destroyed. Main reactor went critical, vaporized the lot.
Doctor: Like I said. Once. There's a banana grove there now. I like bananas. Bananas are good.
Jack Harkness (to Doctor): Jack Harkness. I've been hearing all about you on the way over.
Rose Tyler: He knows, I had to tell him. About us being Time Agents.
Jack Harkness: And it's a real pleasure to meet you, Mr. Spock.
Doctor: Mr. Spock?
Rose Tyler: What was I supposed to say? You don't have a name. Don't you ever get tired of "Doctor"? Doctor who?
Doctor: Nine centuries in, I'm coping.
Doctor: When we met I said, "Travel with me in space." You said, "No." Then I said, "Time machine."
Rose Tyler: It wasn't some big plan. I just saw it happening, and I thought, "I can stop it."
Doctor: I did it again. I picked another stupid ape. I should have known. It's not about showing you the universe. it never is. It's about the universe doing something for you.
Rose Tyler: So it's okay when you go to other times and you save people's lives but not when it's me saving my dad?
Doctor: I know what I'm doing, you don't.