Dalek

VAN STATTEN: We're hidden away with the most valuable collection of extra-terrestrial artefacts in the world, and you just stumbled in by mistake.

DOCTOR: Pretty much sums me up, yeah.

VAN STATTEN: I thought you were the great expert, Doctor. If you're so impressive, then why not just reason with this Dalek? It must be willing to negotiate. There must be something it needs. Everything needs something.

DOCTOR: What's the nearest town?

VAN STATTEN: Salt Lake City.

DOCTOR: Population?

VAN STATTEN: One million.

DOCTOR: All dead. If the Dalek gets out, it'll murder every living creature. That's all it needs.

VAN STATTEN: But why would it do that?

DOCTOR: Because it honestly believes they should die. Human beings are different, and anything different is wrong. It's the ultimate in racial cleansing and you, Van Statten, you've let it loose!

DOCTOR: The Daleks have failed! Why don't you finish the job and make the Daleks extinct. Rid the Universe of your filth. Why don't you just die?

DALEK: You would make a good Dalek.

DOCTOR: Your race is dead! You all burnt, all of you. Ten million ships on fire. The entire Dalek race wiped out in one second.

DALEK: You lie!

DOCTOR: I watched it happen. I made it happen.