Ashildr/Me: I don't want your TARDIS. That's not what this is about. Rigsy come here, I'll remove your chronolock.
The Doctor: What is this Ashildr? You can't possibly think this is going to keep me here.
Ashildr/Me: It's not a restraint. It's a teleport bracelet.
Clara: What?
Ashildr/Me: I'll give you time to say goodbye, don't worry. No one will be hurt.

Rigsy: You're serious? You actually expect me to give you my death sentence?
Clara: I've always wanted a tattoo. You know, something small. Discreet.
Rigsy: Clara, cut it out.
Clara: Why aren't you listening? I'm under the Mayor's personal protection and it's absolute, apparently. Look she controls the raven, so I will never have to face it.

Clara: What now? We can't stay in here, we're going to freeze to death. We can't go back out there because the sandmen will get us.
The Doctor: Sandmen?
Clara: Yeah it's a good name. Fits, like the song.
The Doctor: No no no no you don't get to name things. I'm the Doctor. I do the naming.

What used to be sleep in your eye, has turned into a carnivorous life form.

The Doctor

The Doctor: But sleep is vital. Sleep is wonderful. Even I sleep.
Clara: When?
The Doctor: Well, when you're not looking.

24 hours ago this station fell silent. No comm signal, nothing. Dead. We've come to find out why.

Nagata

You can't fight them Doctor. There's no point. They're the future. A new life form. A better life form. It's very clear to me now, they made me understand. And we're to be their food.

Rassmussen

Nagata: What are you doing?
The Doctor: I've hacked into your helmet-cams.
Nagata: What?
The Doctor: Reviewing the footage. There's something not right here.
Nagata: We don't have helmet-cams.

They came to find me. This is my station. My lab. I've pieced together the rescue as best I could.

Rassmussen

Osgood: Never really met Clara. Pretty strong, yeah?
The Doctor: She was amazing.
Osgood: No, not was... is. It's not from the Zygon. It's from Clara.
The Doctor: How?
Osgood: She's not dead. She's in a pod somewhere.

Bonnie: It's empty, isn't it? Both boxes. There's nothing in them, just buttons.
The Doctor: Of course, and you know how you know that? Because you've started to think like me.

The Doctor: Let me negotiate peace. You can't commit mass murder...
Kate: Then why did you leave the gas with us?
The Doctor: The boxes are safeguards for both species.

Doctor Who Quotes

Only in darkness are we revealed. [...] Goodness is not goodness that seeks advantage. Good is good in the final hour, in the deepest pit, without hope, without witness, without reward. Virtue is only virtue in extremis. This is what *he* believes, and this is the reason above all I love him, my husband. My madman in a box. My Doctor.

Nardole [quoting River Song]

Once, long ago, a fisherman caught a magic haddock. The haddock offered him three wishes in return for its life. The fisherman said, “I’d like for my son to come home from the war. And a hundred pieces of gold.” The problem is, the magic haddock, like robots, don’t think like people. The fisherman’s son came home from the war, in a coffin. And the king sent a hundred gold pieces in recognition of his heroic death. The fisherman had one wish left. What do you think he wished for? Some people say he should have wished for an infinite series of wishes, but if your city proves anything, it is that granting all your wishes is not a good idea. [...] In fact, the fisherman wished he hadn’t wished the first two wishes.

The Doctor