The Superman

Plot
The movie begins in Krypton; Brainiac was the planetary-wide supercomputer of Krypton. Jor-El Conducting research on a series of earthquakes rocking Krypton, Jor-El discovered evidence krypton's imminent destruction. However, his findings were deliberately dismissed by the supercomputer Brainiac who the Council decided to believe. Still unwilling to admit that he might be mistaken, Jor-El investigated, and found that Brainiac had deliberately lied in order to give himself time to escape. By then, it was too late, as Krypton was to explode in a matter of hours. Jor-El could only put his backup plan into effect: to use his spacecraft to save his son, Kal. Programming the ship to carry Kal to Earth.

Time jump. Metropolis

superman in Metropolis saving people while he's a reporter for the Daily Planet with Lois lane. Lex Luthor natural genius and his general lack of conscience, Luthor assembled a vast fortune and founded LexCorp as businessman in Metropolis who throw Metropolis to oversee a cooperative venture between Wayne Enterprises and LexCorp fundraiser with some rich businessman where Bruce Wayne meet lois and Clark while doing interview others. That night, bruce dress as batman follow lex and see that he's meeting mercenary John Corben. lex luther manipulation john under going Surgery so he can turn john in to Metallo. later metallo attack superman and have fight but superman start to fall in sick due to  Kryptonite. just when metallo about to take last blow on superman; batman arrive and save him. metallo was defected. superman ask for the kryptonite to batman. he tell him that he will get to him later cover with lids so it don't affect him. superman  peeks behind the mask and sees that Batman is Bruce Wayne. batman get angry and tell him that he will find him and give back kryptonite. later, Superman at his apartment,  he notices a small, bat-themed homing device planted on his cape and picks it up. Clark goes to look out his window,  He uses his telescopic vision and spots Batman on the roof of a distant building, watching him through binoculars. Knowing Clark can see him, Batman smiles and with a boy scout salute, jumps down out of sight on the far side. Clark realizes Batman has now discovered his secret identity as well.

Bruce later meet Clark to give him the Kryptonite and told him that lex hire metallo. Clark say that he will meet with lex but bruce told him that they should go together.. he think that's more to that. they change as superman and batman and go see lex; as lex is already was ready for them as he got suit of himself made with Kryptonite to fight superman. with the help from batman superman defeat lex and put him in prison.

Post Credits Scene
After Luthor went to prison, he appointed Mercy as acting head of LexCorp. As Mercy close the computer and left Lexcorps; the computer get turn on automatically and on the screen we get to see Brainiac symbol.

Trivia

 * Bruce Timm appears in a very short cameo as a man who's selling The Daily Planet news paper.
 * Green Lantern Arkkis Chummuck have cameo where he meet with Jor-El at Krypton.
 * Storyline inspired by Superman/Batman: Public Enemies comic and Superman: The Animated Series episode ""The Last Son of Krypton" and "World's Finest"