DOCTOR: Words matter! One death, one ripple, and history will change in a blink. The future will not be the world you know. The world you came from, the world you were created in won't exist, so neither will you.

DOCTOR: Cos sometimes this team structure isn't flat. It's mountainous, with me at the summit in the stratosphere, alone, left to choose.

CLAIRE: This enigmatic person of yours, would you trade them for reliable and dull?

YASMIN: My person's a bit different.

MARY: I don't think they're really from the colonies.

BYRON: No. She is from somewhere much, much stranger.

POLIDORI: The north.