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The Doctor: You can stop this right now. We can leave this planet. We can fight across the constellations if that's what you want, but not on Earth!
The Master: It's too late.
The Doctor: Why do you say that?
The Master: The drumming.
[taps out a drumbeat on the table with his fingers]
The Master: Can't you hear it?
[taps the beat again, continuously]
The Master: Inside my head. I thought it would stop. But it never does. It never, ever stops. Inside my head. The drumming, Doctor, the constant drumming.
The Doctor: I can help you. Please, let me help.
The Master: It's everywhere. Listen. Listen. Listen. Here come the drums... here come... the drums...
don't ever have a roommate, ever.