[mdchiefsfan]

Given how Lex Luthor, in the comics, is pro-human and pro-Metropolis and that city just got destroyed by aliens, I have a feeling that is how he will be introduced. He will reach out to Bruce Wayne to help restore Metropolis to where it was before.

Bruce Wayne, having seen what just occurred and being the detective he is, will want to investigate any potential threats that may arise again and how to deal with those potential threats. He comes to Metropolis cautious and suspicious as he generally is about anything new and discovers kryptonite is Superman's weakness. They square off until it is realized that there are more threats in the world than each other. They team up and whip some ass.

That's how I see this movie going down.