The Batman v Superman: Dawn of Justice trailer released in December set up the conflict between the man from Gotham and the alien from Krypton: Bruce Wayne (Ben Affleck) worries that Superman (Henry Cavill) isn't trustworthy, which is a problem, since he's capable of destroying the world.
But the third and final trailer, released on Thursday, is all about the battle. It's full of signature Zack Snyder bone-crushing brawling, Batman-on-Superman combat, gadgets and explosions.
