Marvel Studios upcoming “Thor” and “Captain America” look to be huge hits, but there’s no way of knowing before the films are released into theaters. No one wants to be known for an unsuccessful film, which can potentially follow them their entire careers (John Travolta, no matter what he does, cannot shake the sheer, unrelenting badness that is “Battlefield Earth“). So, while there’s no such thing as a sure thing, many actors won’t venture outside their comfort zone for projects. For example, Clint Eastwood was originally considered to play Superman in Richard Donner’s 1978 film, but didn’t accept the role.
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