3 Years before Batman,Bruce rushes to metropolis where Superman battles with Zod.
In the Presents,Bruce adopts Dick Grayson after his Parents died in a horrible accident. He tells him that it happened to him long time ago.
At Metropolis,Mercy Graves shows Lex Luthor kryptonite,a green rock that was found. She also show him the container a strange substance they found in Zod's ship. Bruce went to the metropolis to attend at the gala where he met Clark. Bruce went down to investigate and to notice Kryptonite. Then,the Gala was interrupted by an Alien Bounty Hunter named Lobo. Bruce fled to his car & suit up as Batman. Lobo asks for Kal-El. Batman appears & confronts him. Lobo whips him with his chains,but Batman dodges it. Superman appears & defeats Lobo. He tells Batman that if they shine a light in the sky,He won't go to it. Batman ask Superman if he bleed. Superman couldn't answer & fled.
A worker named Raymond Jensen gets merged with the substance that was broken free from the container by Lobo. As Batman looked over the horizon,a homeless man appeared and says a lot of stuffs happen. Back at Wayne Manor,Dick discovers the Batcave & confronts Bruce about this,but promise that his identity needs to be kept. Raymond absorbs confronts Superman & fought eachother. Superman holds him down & leaves him saying killing him isn't the way. Jimmy Olsen arrives at the scene of the fight & tells him something is going on at Metropolis.
Superman confronts Jensen,who transform into a Parasite like Monster. Luthor order Graves to overload the Power Plant,which could personally destroy half of Metropolis. Batman saw this & helps Superman,but gets overpowered. They are saved by a Homeless Man that Batman met,who reveals to be J'onn J'onzz,a Martian in disguise. He tells him that the two are the good guys,who takes responsibility for others. The Power Plant begun to overload and Parasite sacrificed himself to stop it.
Batman and Superman thanked eachother. J'onn tells them that Lobo was just the beginning,saying there will be more invaders. Batman ask if there's any more heroes here. J'onn says "There are". Unbeknownst to them,a single substance that survives the fight slithers away.
Mid-Credits:
Alfred has made a Suit for Dick.
Post-Credits:
At Lexcorp,A Tiny blue & pink starfish that was found on Zod's Ship escaped & possessed one of the workers.