<P> Bruce attends a gala at LexCorp to steal encrypted data from the company's mainframe, but has it taken from him by an antiquities dealer named Diana Prince; she eventually returns it to Bruce . While decrypting the drive, Bruce dreams of a post-apocalyptic world, where he leads a group of rebels against a fascist Superman . He is awoken from his vision by an unidentified person who warns him of Lois Lane's crucial role in the future, and urges him to find "the others" before vanishing . Wayne later discovers that Luthor is also investigating metahumans . One of them is Prince herself, who is shown in a photo taken during World War I. Wayne admits to Alfred Pennyworth that he plans to steal the kryptonite to weaponize it, should it become necessary to fight Superman . </P> <P> At a congressional hearing, as Finch questions Superman on the validity of his actions, a bomb goes off and kills everyone present but Superman . Believing he should have detected the bomb, and frustrated by his failure to save the people, Superman goes into self - imposed exile . Batman breaks into LexCorp and steals the kryptonite, planning to use it to battle Superman by building a powered exoskeleton, creating a kryptonite grenade launcher, and a kryptonite - tipped spear . Meanwhile, Luthor enters the Kryptonian ship and accesses details of a vast technology database accumulated from over 100,000 worlds . </P> <P> Later, Luthor kidnaps Lois and Martha Kent, Clark's adoptive mother, to bring Superman out of exile . He reveals to him 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 fights Superman and eventually subdues him . Before Batman can kill him with the spear, Superman urges Batman to "save Martha", whose name is also shared with Bruce's late 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 a genetically engineered monster with DNA from both Zod's body and his own . Diana Prince arrives unexpectedly; revealing her metahuman nature, she joins forces with Batman and Superman to fight the creature . It becomes clear that the creature can absorb and redirect energy, and outmatches Prince, Batman and Superman . Realizing that the creature is vulnerable to kryptonite, Superman retrieves the kryptonite spear . With Batman and Prince's help containing it, Superman impales the monster, killing it . In its last moments, the creature stabs a weakened Superman with one of its bone protrusions, apparently killing Superman . </P>

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