Superman vs. Hulk

Today, we begin Round 2 of our Superhero Showdown bracket game, moving one step closer to deciding which costumed crimefighter is the greatest superhero ever. The Round of 16 kicks off today with four agonizing big-ticket match-ups. Superman and Thor enter the arena, representing the dead planet Krypton and the heavenly realm of Asgard. Fresh from an upset victory over Ghost Rider, Hellboy will battle Captain Marvel for supernatural supremacy. Green Lantern and Invisible Woman will hurl energy at each other, some of it green, some of it invisible. And in the final bout,

Click on the image above for a printable bracket. Check out our pocket biographies of each superhero, and scroll to the bottom of each page to register your vote. Voting will conclude in exactly 48 hours, at 12:30 PM EST on August 15. Be sure to check back tomorrow for the other half of Round 2: Batman vs. The Punisher, Wolverine vs. Jean Grey, Wonder Woman vs. Captain America, and Iron Man vs. Deadpool.