Doctor Who (TV Series)
Last of the Time Lords (2007)
Ellie Haddington: Professor Docherty
Photos
Quotes
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Toclafane : But then the Master came with his wonderful time machine to bring us back home.
Professor Doherty : But that's a paradox. If you're the future of the human race, and you've come back to murder your ancestors. You should cancel yourselves out. You shouldn't exist!
Martha Jones : And that's the paradox machine.