Quotable Who

Doomsday
Cyberman: Daleks be warned. You have declared war upon the Cybermen.
Dalek Sec: This is not war. It is pest control.
Cyberman: We have 5 million Cybermen. How many are you?
Dalek Sec: Four
Cyberman: You would destroy the Cybermen with four Daleks?
Dalek Sec: We destroy the Cybermen with one Dalek. You are superior in only one respect.
Cyberman: What is that?
Dalek Sec: You are better at dying.

Smith and Jones
Doctor: Crossing into established events is strictly forbidden, except for cheap tricks

The Family of Blood
Tommy: I've seen him. And he's like fire and ice and rage. He's like the night and the storm in the heart of the sun. He's ancient and forever. He burns at the center of time and he can see the turn of the universe. And he's wonderful.

Blink
Doctor: Your life could depend on this: Don't blink. Don't even blink. Blink and you're dead. They are faster than you can believe. Don't turn your back, don't look away and don't blink. Good luck.
Larry Nightengale: The Angels have the phone box. That's my favorite. I've got it on a tee-shirt.

Utopia
Doctor: And Utopia is?
Professor Yana: Oh, every human knows of Utopia. Where have you been?
Doctor: Bit of a hermit.
Professor Yana: A hermit ... And friends.
Doctor: Hermits united. We meet up every ten years. And swap stories about caves. It's good fun. For a hermit.

Professor Yana opens his fob watch and comes to a realization:
"I AM the Master."