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>Lex Luthor is asked by the US government to be a consultant on the Brainiac problem
>Superman begrudgingly works with Lex.
>Kara and Steel are in the movie to
>Brainiac is defeated, the world is saved, but during the climax Lex shows his true colors and almost kills every occupant on Brainiac's ship. Lex is stopped but no one knows the truth except the heroes
>Lex is given a full pardon and gets his company back for having a hand in saving the world, he's now untouchable thanks to optics and government backing
>Lex also, unbeknownst to the US government, now has Brainiac tech at his disposal
>Stinger is that Lex is standing inside The Hall of Doom, newly constructed and built using this tech