How do batman and superman work together against lex luthor?

In James Gunn's Man of Tomorrow, Superman and Lex Luthor form an unlikely alliance. The film reveals that their traditional conflict is superseded by a more pressing danger: Brainiac, a superintelligent alien conqueror. This partnership is described as reluctant, suggesting that their mutual animosity is set aside only due to the existential threat they both face. The dynamic explores how ideological differences can be bridged when facing a common enemy, while maintaining their core conflict. This represents a significant shift from their classic Batman/Superman vs. Lex Luthor narrative, as it positions Luthor as an uneasy ally rather than the primary antagonist.