When Lexcorp accidentially unearths the intergalactic serial killer Doomsday, Superman battles the creature head-on in the fight of his life... literally. 

The world collectively mourns its fallen hero; humanity realizes it will never feel truly safe again. Superman's enemies rejoice - all but Lex Luthor, who grieves the loss in his own demented manner, setting off a chilling chain of events that even he couldn't have foreseen.