The Master: One must rule or serve. That is the basic law of life. Why do you hesitate? Surely it's not loyalty to the Time Lords, who exiled you to one insignificant planet?
The Doctor: You'll never understand. I want to see the universe, not to rule it.
--
The Doctor: I'm sorry to tell you that Romana can look after herself. We're Time Lords. Not like those innocents on Atrios, you know. Time Lords, sent by the Guardian to recover the Key to Time.
The Shadow: I know who you are, Doctor, I have always known. I have been waiting for you. I too serve a Guardian, a Guardian equal and opposite in power to the one you serve. The Black Guardian - he who walks in darkness. And you are in the valley of the Shadow!
