Joseph Gordon-Levitt: The scrawny former sitcom star launched his big screen career with dark dramatic roles in indie flicks "Mysterious Skin" and "Brick," as well as a number of others, before taking on lighter fair with 2009's "(500) Days of Summer." Playing Cobra Commander in 2009's "G.I. Joe: The Rise of Cobra" didn't do much for him, but the 2010 blockbuster "Inception" sure did.
