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I actually don't really agree that Joe Manganiello would make a good Brian Clauser. When I read the book and listened to the podcast I did not envision someone like Joe Manganiello. I see Clauser as more pale and fit, but not buff kind of guy. Off the top of my head, and because Priest was on a few days ago, I would think Paul Bettany might look the part better. Or Karl Urban. Plus they both I think are good actors. And I guess I need clairfication on the "active movie star. Yes they both have been in movies recently but is there a level of activeness? Bettany is in 1 pre-production and 1 post-production. Urban on the other hand is 2 of each. So that might shoot them down right away.
A couple others that I think also could do well:
Zachary Levi - not sure on his "badass" beleivability
Josh Hartnett - unless he is being kept in your back pocket to play Perry Dawsey?
The more I think about it, the more I am thinking Paul Bettany.