The end of the world is nigh, right? That's what we're told at least.
On December 21, the world will end. So said the Mayans, apparently, and how can the Mayans be wrong?
Of course he didn't completely kill Superman, but for awhile there everyone was really sad, and Doomsday was the reason. Players will be able to side with Superman to take the massive beast down, or team up with Superman's arch-enemy Lex Luthor as he attempts to capture Doomsday for his own sinister purposes.