Joseph Gordon-LevittWhen news broke last month that Joseph Gordon-Levitt would likely join Christopher Nolan's 'The Dark Knight Rises,' comic geeks and Internet movie bloggers dashed off to their own personal Batcave to try to figure out just who the actor might play.

Speculation was rampant and covered a variety of characters from Batman's infamous rogue's gallery, including The Riddler and Deadshot. Those two bits of speculation didn't pan out, but one other popular choice appears to be correct.

Variety says JGL is set to play Alberto Falcone, better known as "The Holiday Killer."

If you're scratching your head wondering, "Who the hell is Alberto Falcone?" you're probably not a big comic fan. Allow us to get you up to speed.