DOCTOR: “It’s mostly a whiff I get. Evil, pure evil. When you’ve been after it as long as I have, it starts to feel like a bad stench in the air. And this city is filled with it.”

DOCTOR: “I’m sort of a cosmic environmentalist. I like things to be tidied up and smelling pretty.”

DOCTOR: “It’s not just the TARDIS that has relative dimensions, Ace, but the societies that we visit, too.”