<P> At a Congressional hearing, as Finch questions Superman on the validity of his actions, a bomb smuggled by Luthor goes off and kills everyone present but Superman . Believing he should have detected the bomb, and frustrated by his failure to save them, Superman goes into self - imposed exile . Batman breaks into LexCorp and steals the kryptonite . In preparation to battle Superman, he builds a powered exoskeleton, creates a kryptonite grenade launcher, and a kryptonite - tipped spear . Meanwhile, Luthor enters the Kryptonian ship and accesses a vast technology database accumulated from over 100,000 worlds . </P> <P> To bring Superman out of exile, Luthor kidnaps Lois and Martha Kent, Clark's adoptive mother . He reveals to Superman that he manipulated Superman and Batman by fueling their distrust for each other . Luthor demands that Superman kill Batman in exchange for Martha's life . Superman tries to explain the situation to Batman, but instead Batman attacks Superman and eventually subdues him with the aid of a kryptonite gas . Before Superman can kill Batman with the spear, Batman urges Superman to "save Martha", whose name is also shared with Superman's mother, confusing him long enough for Lois to arrive and explain what Superman meant . Realizing how far he has fallen and unwilling to let an innocent die, Batman rescues Martha, while Superman confronts Luthor on the scout ship . </P> <P> Luthor executes his backup plan, unleashing Doomsday, a genetically engineered monster with DNA from both Zod's body and his own blood . Diana Prince arrives unexpectedly; revealing her metahuman nature, she joins forces with Batman and Superman to eliminate the creature . When they are all outmatched, Superman realizes its vulnerability to kryptonite, and retrieves the spear to kill it . In the creature's last moments, it kills Superman, himself weakened by exposure to kryptonite . </P> <P> Luthor is arrested and Batman confronts him in prison, warning Luthor that he will always be watching him . Luthor gloats that Superman's death has made the world vulnerable to powerful alien threats . A memorial is held for Superman in Metropolis . Clark is also declared dead, with various friends and family members including Bruce Wayne and Diana Prince attending his funeral in Smallville . Martha gives an envelope to Lois, which contains an engagement ring from Clark . After the funeral, Bruce expresses his regrets to Diana about how he failed Superman . He reveals to her that he plans to form a team of metahumans, starting with those from Luthor's files, to help protect the world in Superman's absence . After they leave, the dirt atop Clark's coffin levitates . </P>

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