The Doctor: Right, physics! Physics, eh? Physics, physics, physics, physics, physics, physcis. Physics! Hope you're getting all this down.
Sarah Jane Smith: [Sarah Jane and Rose are once again squabbling over the Doctor] I had NO trouble with space-stuff. I've seen things you wouldn't believe!
Rose Tyler: Try me!
Sarah Jane Smith: Mummies!
Rose Tyler: I've met ghosts.
Sarah Jane Smith: Robots, lots of robots!
Rose Tyler: Slitheen, IN Downing Street!
Sarah Jane Smith: Daleks!
Rose Tyler: Met the Emperor.
Sarah Jane Smith: Anti Matter Monsters!
Rose Tyler: Gas Mask Zombies!
Sarah Jane Smith: Real life Dinosaurs!
Rose Tyler: Real life Werewolf!
Sarah Jane Smith: THE LOCH NESS MONSTER!
Rose Tyler: Seriously?
The Doctor: Correct-o-mundo! There's a word I've never used before, and hopefully never will again.
Rose Tyler: What do I do? Do I stay with him?
Sarah Jane Smith: Yes, some things are worth getting your heart broken for.
Rose Tyler: I've been to the year five million, but this, this is really seeing the future- you just leave us behind! Is that what you're going to do to me?
The Doctor: No. Not you.
Rose Tyler: But, Sarah Jane- you were that close to her once, and now... you never even mention her. Why not?
The Doctor: I don't age. I regenerate. But humans decay. You wither and you die. Imagine watching that happen to someone you...
Rose Tyler: What, Doctor?
The Doctor: You can spend the rest of your life with me. But I can't spend the rest of mine with you. I have to live on, alone. That's the curse of the Timelords.
Rose Tyler: They're rats! Vacuum packed rats!
The Doctor: [to Mickey] And you decided to scream.
Mickey Smith: It took me by surprise!
The Doctor: Like a little girl!
Mickey Smith: It was dark, I was covered in rats!
The Doctor: Nine, maybe ten years old. I'm seeing pigtails and a frilly skirt.
Mickey Smith: Okay, no time to explain, we need to get inside the school. Do you have, like, I don't know, a lock picking device?
K9: We are in a car.
Mickey Smith: Maybe a drill attachment?
K9: We are in a car.
Mickey Smith: Fat lot of good you are
K9: We are in a car.
Mickey Smith: Wait a second. We're in a car.
Mickey Smith: [shouts out window] Get back!
[crashes car through main doors]
Sarah Jane Smith: I can't believe it's you
[a scream echoes through the building]
Sarah Jane Smith: Okay, now I can.
Sarah Jane Smith: No. The universe has to move forward. Pain and loss, they define us as much as happiness or love. Whether it's a world, or a relationship... Everything has its time. And everything ends.
The Doctor: They're Krillitanes!
Rose Tyler: And is that bad?
The Doctor: Very. Think how bad things could possibly be, then add another suitcase of bad.
Mickey Smith: You see, what's impressive is we met her nearly an hour ago and I still haven't said "I told you so" yet.
Rose Tyler: I'm not listening to this.
Mickey Smith: Though I have prepared a little "I was right" dance which I can show you later.
Sarah Jane Smith: [to Rose about the Doctor] Does he still stroke bits of the Tardis?
The Doctor: [sadly, after K9 has offered to sacrifice himself] You good dog.
K9: [wags his tail] Affirmative!
[Having backed out, slowly and carefully, from a utility closet, unable to take her eyes from what she'd discovered inside but scarcely believed: the infinitely recognizable, unforgettable, and surely impossible blue Police Box form she knew as the TARDIS, she turns around to find the school teacher she'd met earlier, John Smith, the man whose name she'd commented as being the same as the alias her old friend used - the friend with whom she'd traveled so long ago in that same impossible box - having seen her back out, trembling and haunted, from that utility closet]
The Doctor: Hullo, Sarah Jane.
Rose Tyler: With you, did he do that thing where he'd explain something at like, 90 miles an hour, and you'd go "What?", and he'd look at you like you've just dribbled on your shirt?
Sarah Jane Smith: All the time!
Sarah Jane Smith: Does he still stroke bits of the TARDIS?
Rose Tyler: [giggling] Yes, he does! I'm like "do you two want to be alone"?
The Doctor: [walks into the lab] How's it going?
The Doctor: What? Listen, I need to figure out what's programmed inside these?
The Doctor: What?
The Doctor: Stop it!
The Doctor: If I don't like your plan, it will end.
Mr. Finch: Fascinating. Your people were peaceful to the point of indolence. You seem to be something new. Would you declare war on us, Doctor?
The Doctor: I'm so old now. I used to have so much mercy. You get one warning. That was it.
Sarah Jane Smith: The Doctor likes traveling with an entourage. Sometimes they're human, sometimes they're aliens and sometimes they're tin dogs.
Sarah Jane Smith: What about you? Where do you fit in the picture?
Mickey Smith: Me? I'm their man in Havana. I'm their technical support. I'm...
Mickey Smith: Oh my god. I'm the tin dog!
Rose Tyler: [referring to K-9] Why does it looked so... disco?
The Doctor: Oi! Listen, in the year 5000 this was cutting edge!
Sarah Jane Smith: You can tell you're getting older, your assistants are getting younger.
Rose Tyler: I'm not his assistant.
Sarah Jane Smith: No?
[to the Doctor]
Sarah Jane Smith: Get you, tiger.
Mickey Smith: Oh, mate, the missus and the ex. Welcome to every man's worst nightmare!
Mr. Finch: [walking the halls while making fingerings with his left hand as if playing a three-keyed brass instrument, then sings softly] Bom bom bom bom / Da-bom bom bom.
Mr. Finch: [He walks just past Nina waiting in a chair by his Headmaster office, stops, and turns taking notice of her] What do you want?
Nina: The nurse sent me, sir. I was in English and I got a headache.
Mr. Finch: Then don't bother me, go home.
Nina: I can't.
Mr. Finch: Why, is your mother at work?
Nina: I live in Ambrose Hall. The children's home.
Mr. Finch: [conciliatory] No parents. No one to miss you. I see why the nurse sent you. You poor child. Poor... thin... child. Come inside. It's nearly time for lunch.
Mickey Smith: Surveillance. If you ask me it's just another way of saying, 'Go sit at the back of the class with the safety scissors and glitter.'
Mickey Smith: That would be me talking to a metal dog, then.
The Doctor: It's very well behaved, this place. I thought they'd all be happy-slapping hoodies. Happy slapping hoodies with ASBOs. Happy slapping hoodies with ASBOs and ringtones!
Sarah Jane Smith: I thought you died. I waited for you and you didn't come back and I thought you must have died!
The Doctor: I lived. Everyone else died.
Sarah Jane Smith: What do you mean?
The Doctor: Everyone died, Sarah.