George Costanza. Carrie Bradshaw. Walter White. Certain iconic TV characters have become part of pop-culture history, thanks to lots of things -- the series, the audience, the time period, and of course, the actors playing them. But some of the small screen's most famous characters were almost portrayed by different stars. Would the shows have been as successful? Would the actors have become as famous? There's no way of telling, but click through this slideshow to see which stars could have become your favorite TV characters.