The Doctor: There's been a Dalek buried on Earth since the 9th Century, waiting to revive.
Mitch: I'm sorry. A what?
Graham: Alien psychopath.

Mitch: Where are you going? What are you doing?
Graham: Just follow and do what she says, mate.

The Doctor: Lin and that creature. They're together.
Mitch: You mean, it's holding her hostage?
The Doctor: I'm really sorry, Mitch, I think it's crueler than that. I think it's using her to move about.
Mitch: How can you be so sure?
The Doctor: I learn to think like a Dalek a long time ago.

Lin/Dalek: Who has access to the archives?
Richard: Today, it's just me. Most secure digits in Yorkshire, that's what told me by a friend anyway. I probably shouldn't be telling you that. I'm new at this.

Lin/Dalek: Who are you?
The Doctor: I'm your secret conscience... not really, we both know you don't have one.

She once said to me,'If anyone ever asks about me after I'm gone, you tell them I was lucky. Tell them I gave someone life, I watched him grow, and I was proud.'

Graham

I wish I was better at life, Graham.

Aaron

The Doctor: I'm going to find that creature.
Yaz: You can't do that on your own.
The Doctor: Always have done. Me and a Dalek? It's personal.

The Doctor: So that's what you've been doing. Reconstructing yourself from memory and remnants... and spare parts?
Dalek: I am rebuilt!
The Doctor: What do you call this look? Junkyard chic?

Dalek: Humanity will surrender!
The Doctor: They really won't, trust me. I've seen them in action. They've fought off so many things, including the worst of their own people. They're really stubborn. Have you not worked that out yet?

Yaz: How'd it go? What happened?
Ryan: Did you get rid of it?
The Doctor: Not quite.
Yaz: How much 'not quite'?
The Doctor: Not at all. Slightly riled it and let it get away. And now it's in a tank, trying to summon the fleet.

The Doctor: How are you feeling, Lin?
Lin: Shaky
The Doctor: I'm not surprised. You will for a while. But you kept fighting it, thank you. Take these. Three a minute for four minutes. Don't take with alcohol, you'll grow an extra head. That was an embarrassing party.