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

Doctor Who Season 9 Episode 9 Quotes

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