This is a long one, but here we go.
Open with death of Robin, Batman unmasks while cradling Robin's body, revealing his face. This is cross-cut with the death of Bruce Wayne's parents.
Title: Batman v Superman
Metropolis battle flashback from Bruce's POV
18 months later...
Superman is performing saves around the world after the Metropolis attack. He's a popular figure among the downtrodden and now the charming hero we expect him to be. As a gesture of peace, he has allowed the US government to keep the scout ship. The world still is unsure how to feel about him, so he's trying very hard to prove himself a savior.
He has a quiet life with Lois, but he's frustrated that his Superman persona is limited by geopolitics and his own fallibility, and cannot do more to help people. He can hear the cries every day of those he can't save, and this saddens him.
In Gotham, Batman has grown more ruthless since the rumored death of Robin at the hands of the Joker five years ago. We open with the warehouse action scene and a subsequent car cahse, and KGBeast is easily dispatched and branded, while many of his men are killed. Alfred warns Bruce in the Batcave that he no longer is what he used to be, implying that he enjoys hurting people now. Bruce argues back that his no-kill rule is what cost Robin his life.
We find Lex Luthor, jealous of Superman's power, convincing the government to give him access to the scout ship and the World Engine, and he finds Kryptonite. He contacts Bruce at a gala in Gotham. Bruce drops his playboy persona around him and Lex offers him some Kryptonite, which Bruce accepts later at Wayne Enterprises.
Back at Wayne Manor, Bruce analyzes the Kryptonite and Lex's data. Alfred seems disturbed by Bruce's obsession with Superman, but goes along with Bruce's plan to develop weapons that can stop him. Alfred asks Bruce if he's ever considered Superman may have a human persona, but Bruce rejects the notion and can only see Superman as inhuman.
Meanwhile, Clark catches wind of Batman's vigilantism and decides that if he can't do all he can as Superman, he should at least try to as Clark Kent. He and Lois venture to Gotham to expose Batman as a criminal. Clark visits GCPD, looks through old records, and discovers Batman's appearance coincides with Bruce Wayne's return to Gotham 20 years ago. He also finds out Batman's methods used to be less brutal. Lois focuses on Batman's high-tech gadgets and discovers Wayne Enterprises invested in projects like a powerful military car and a grappel gun that were eventually canned - and are used by Batman.
That night, some of Luthor's experimental drones are hacked in Gotham and turn on its citizens, forcing Superman and Batman to come to the city's rescue. Superman easily takes out some drones and does so while protecting people, while Batman brutally knocks them out of the sky with the Batwing, forcing Superman to stop the debris from hitting the city. The two of heroes angrily confront each other after the battle. Superman warns Batman to stop his cruelty or stop being a vigilante, and reveals he doesn't need X-ray vision to know he is Bruce Wayne; Batman warns Superman that his time will come and asks him if he bleeds. Superman flies back to Metropolis.
Clark and Lois are assigned to interview Luthor after the disaster. Luthor appears distraught over the incident, and disparages Superman's intervention as "reckless." Clark, visibly hurt by the comment, argues that Superman is here to do good and he wants to help people, but Luthor says humanity should not be lifted up by gods, that humanity should rise up on their own to be stronger. Clark leaves the interview bitter. A scene reveals Luthor has been tailing Clark for some time now and knows he is Superman.
Clark later confides in Lois that he's tired of being hurt by what people think of him. Lois suggests he hold a press conference and announce his intentions to the world. Then he flies off to save a girl from committing suicide, and we see he has to make a complete 180 and become the shoulder to lean on.
Meanwhile, Bruce finishes developing the Kryptonite weapons. Bruce gives Alfred his 1% speech and tells him he is going to save the world. Alfred reveals how much he despises what Bruce is becoming and leaves Wayne Manor. Bruce later leaves for another gala, which Clark is covering. Clark confronts Bruce, revealing his identity. Bruce is initially taken aback, but rejects Clark's humanity. Clark tells Bruce he won't let him hurt any more people; Bruce says the same.
Lex learns more about the ship and decides to create Doomsday as a fail-safe in case the upcoming battle does not go as planned. Mercy Graves asks him why he didn't use Doomsday first. Lex replies he wants humanity to make God bow.
Superman contacts the mayor of Metropolis and a press conference is later held at the Black Zero memorial (there is no Supes statue yet). Superman is suddenly weakened by a Kryptonite ray from an unknown source and his heat vision goes nuts, destroying part of the park and city. Clark thinks Bruce is behind it; Bruce thinks Clark attacked the city. Superman flies away. The city goes on high alert.
That night, Batman calls Superman to Gotham. Before going, Clark and Lois talk. Lois tells him not to go, that she doesn't think Bruce is behind it, and even if he is, Clark should go through the police instead. Clark refuses, telling her that Superman needs to prove himself, not be saved by others.
Lois frantically attempts to stop the fight.
Superman arrives, and both accuse the other of causing the disaster. The fight is vicious as both heroes tear through an abandoned part of Gotham. The fight ends when Superman restrains himself from crippling Batman, allowing Batman to gain the upper hand with the Kryptonite spear. Clark tells Bruce to tell Lois he loves her just as Lois bursts in from a DP helicopter. This stops Bruce from killing him, as he realizes he is becoming a murderer.
Superman and Batman both realize they are on the same side. They head back to the Batcave, where the three of them deduce that Lex is behind all this. The drones were used to bring them into conflict and he supplied the Kryptonite. Superman and Batman go to Lex at the scout ship, where he unleashes Doomsday. Superman and Batman lead Doomsday away from Metropolis and back to Gotham, where Superman kills Doomsday with the Kryptonite spear.
Back at LexCorp, Superman confronts Lex from outside his office. They discuss Superman's place in the world, and Superman parts telling Lex that he will always be watching. Lex rejects Superman's human identity as a sham. In the end, Lex is secretly horrified by what he has done in his attempt to destroy Superman.
In the aftermath, Superman and Batman are hailed as public heroes, and Clark finally feels satisfied with his heroism. A Supes statue is unveiled. Lex has blamed the incident on the Kryptonian technology and holdover genetic experiments, and suggested that the ship's technology was responsible for causing Superman's powers to go crazy. Bruce reunites with Alfred.
At the Kent Farm, Clark and Bruce decide to work together, and Clark urges they they assemble a league to solve the problems they alone cannot.
Closing title: Dawn of Justice
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