10 Most Heroic Things Lex Luthor Has Ever Done
4. Defeated The Justice Lords - Justice League
One of the all time greatest animated shows ever made is Justice League, and one of their best episodes is A Better World, which - like Injustice - plays with the idea of the League going bad. While it doesn't go into quite as much detail as NetherRealm did with their interpretation of this story, it gives you more than enough to be hooked.
The Justice Lords, having completely crushed their own world under their heel, decide to go to our Earth to "save" it from what they see as a weak and inefficient Justice League.
The League tries to fight them on their own, but of course, fighting your mirror duplicate and people who have worked closely with said mirror duplicates for years, thus knowing everything about them, makes navigating a fight with them rather hard without a wildcard.
Fortunately, Superman found one. Taking a huge gamble (that would bite him in the ass later but that's another story), he requisitioned Lex Luthor's help for defeating the Justice Lords in exchange for a full pardon.