Bill: If there *are* people here, why would they bother writing messages on the surface of the planet?
The Doctor: State visit, patriotic fervor… rogue graffiti artist…

The Doctor: What’re you doing?!
Nardole: Fire, oxygen. Basic physics, innit?
The Doctor: Could’ve been basic *death*!

The Doctor: The simple fact is you don’t belong here. The sooner you get off this planet, the better.
Catchlove: “Don’t belong here”? We’re British! Mars is part of the Empire now!

Iraxxa: And you! Female! What do you say?
Bill [taken aback]: Me?
Iraxxa: We are both surrounded by… noisy males. I would value your opinion.

Well, I daresay the British Army is more than a match for a bunch of upright crocodiles!

Catchlove

There’s no setting for wood! Why is there still no setting for wood?

The Doctor [about his sonic screwdriver]

To die in battle is the way of the warrior.

Iraxxa

Five thousand Roman soldiers. Eyes peeled. They must have left some kind of mark on the landscape -- burning huts, slaughtered locals, sweetie wrappers.

The Doctor

Nardole [about a crow]: But it *talked*!
The Doctor: Well, of course it did. It’s a crow. All crows talk.
Nardole [taken aback]: Well, they don’t talk in the *future*!
The Doctor: Of course they do. Human beings just stopped having intelligent conversations with them, and they all took a bit of a huff.
Nardole: Crows in the future all in a huff?
The Doctor: Of course they are! Haven’t you noticed that noise they make? It’s like a mass sulk!

Listen, you are all very, very angry. And really, you’re just scared. But for now, would you mind awfully just jumping out of your skins and allowing Nardole and I to escape in the confusion?

The Doctor

Nardole: We’re looking for Bill, right?
The Doctor: No, we’re looking for the maximum danger in the immediate area and walking right into it!

The Doctor: So, you thought the Eater of Light could destroy a whole Roman army.
Kar: It did!
The Doctor: And a whole Roman army could weaken or kill the beast.
Kar: Yes.
The Doctor: Well, it didn’t work! You got a whole Roman legion slaughtered, and you made the deadliest creature on this planet very, very cross indeed. To protect a muddy little hillside, you doomed your whole world.

Doctor Who Quotes

There's a horror movie named Alien? That's really offensive. No wonder everybody keeps invading you.

The Doctor

The Doctor: It's a risk.
Graham: Oh, like none of our other trips have ever been risky.
The Doctor: I have apologized for the Death Eye Turtle Army! Profusely.