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The villainous Vandal Savage steal's Batman's top secret file containing the known weaknesses of The Justice League members, pitting the noble superheroes in a fight against the Legion of Doom to save the world from certain destruction. Concerned of the consequences should his fellow crime fighters ever turn their backs on humanity, Batman compiles a list detailing the methods he will need to defeat Superman, Wonder Woman, The Flash, Green Lantern, Martian Manhunter, and Cyborg in the event of an emergency. But when Vandal Savage breaches the Batcave's security and gets his hands on the list, the Justice League must overcome deep feelings of betrayal to defeat the diabolical Legion of Doom. Meanwhile, The Dark Knight struggles to make a decision that could have devastating consequences.