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Roger Moore
Pettyfer braces for the fame 'Number Four' could bring him

Movie stars love playing characters on the run, living on their wits, their survival skills and their will. And audiences can't seem to get enough of this much-loved screen scenario — be it in "Shooter" or "The Fugitive" or a certain amnesiac secret agent. "One reason the Bourne movies are so appealing is that idea of being on the road, on the run," says Alex Pettyfer, star of "I Am Number Four," about young aliens on the run on Earth. "We all fantasize about just taking off, hiding, stealing someone else's car because we know how, living off the grid because we're being chased. It's a dangerous way to live and none of...