Banner mentioned that he would play a villain named 'Gamble', another criminal to help fill out the rogue ranks alongside Heath Ledger's Joker.
Banner, a long-time comic book fan who named himself after the main character in the TV version of The Incredible Hulk, said that he would be eager to play the part but stressed that he couldn't divulge anything more about the character, and that he didn't know if he had landed the part just yet.
MTV also mentions: While the news that he's being considered is a big one for Banner himself, the larger story must be the presence of this mysterious "Gamble" character. Various searches on the Internet, as well as a call to the beloved fellow geeks at L.A.'s Golden Apple Comics, yielded little more than the consensus that this Batman baddie has never appeared in a Dark Knight comic before.
The Dark Knight arrives in theatres on June 18th, 2008.