Superman: Doomsday

Superman and Lois Lane are romantically involved, but Lois is not happy with him not revealing his secret identity to her. While digging, workers from LexCorp unearth the spaceship of Doomsday, a genetically-engineered super-soldier that is highly hostile toward any life form it comes across. It massacres the digging crew and begins a rampage towards Metropolis, killing animals and humans on sight. When Doomsday reaches Metropolis, it decimates the military until Superman arrives. Superman and Doomsday engage in a fierce battle across Metropolis, with Superman eventually winning. But the victory is short-lived as Superman succumbs to his wounds in Lois' arms.