Unless you've been napping for the last couple of years, you've probably noticed that superheros have become a mainstay at the theater. This weekend, "The Incredible Hulk" becomes the second of Marvel Entertainment's properties to hit screens in 2008, and other comic properties will follow soon thereafter. The flow of comic book adaptations hasn't always been this strong though, and in fact, toward the end of the 20th century, one wouldn't have been out of line for thinking we'd never see some of comic's biggest names put to film.