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The Hot Fuzz actor, who appeared in the sci-fi show as a guest star in 2005, admitted that he would not want to replace David Tennant for fear of ruining the series.
He said: "Being the Doctor? I don't think I'd do it for two reasons. One, I'm really loving doing movies. I'm really enjoying working in the US. Second, I really love Doctor Who and I'd hate to have to sit down every Saturday night and have it be me.
"David's done such an incredible job, he's gonna be a tough act to follow. It would feel awful if I just went and balled up the franchise by just being rubbish."
Pegg's next film How To Lose Friends & Alienate People, in which he co-stars with Gillian Anderson and Megan Fox, is scheduled for release in the UK on October 3.
> Moffat: 'Who' will be stressful
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