As it turns out, even superheroes have a dark side. In 'Puncture,' out in limited release on Friday, Chris Evans portrays a crusading personal injury lawyer... who also happens to be addicted to various narcotics. That's right: Captain America is a smack head. What will the little Jimmys and Johnnys of the world think of him?! Fortunately -- or unfortunately, depending on your view -- Evans isn't alone among the cast of 'The Avengers' when it comes to portraying characters of questionable conduct in other projects. Ahead, a closer look at the all-star cast of the upcoming Marvel superhero flick, with particular attention paid to their darker roles.