J’onn J’onzz, the Martian Manhunter, has held on to a secret for decades, one that threatens to shatter not only his relationships, but the Earth itself! When that secret is finally revealed by an enemy, the Justice League of America must swing into action to uncover a vast Martian conspiracy before it can doom the world! But how can the JLA fight super-powerful foes who can effortlessly impersonate anyone? Guest starring the New Titans and the Outsiders, and featuring the final fate of Captain Comet!