Tallulah: That metal thing? What was it?
The Doctor: It's called a Dalek. And it's not just metal, it's alive.
Tallulah: You're kidding me!
The Doctor: Do I look like I'm kidding? Inside that shell, there's a creature born to hate, whose only thought is to destroy everything and everyone that isn't a Dalek too. It won't stop until it's killed every human being alive.
Tallulah: But if that's not a human being, that kinda implies… it's from outer space. (off the Doctor's look) Yet again, that's a no with the kidding. Boy! Well, what's it doing here? In New York?