"What does Doctor Who do, actually? Travels through time and kills insects. Are we obsessed with Doctor Who in this country? In America it's huge, too. But no, I'm definitely not obsessed with Doctor Who. If they offered it to me, I wouldn't know what to say. The idea of playing something for so long isn't... why I do what I do." British actor Dominic Cooper has ruled himself out of the race to become the next Doctor Who as he doesn't want a long-running role on Tv.