Lex Luthor has been elected President of the United States, he's using an earthbound Kryptonite asteroid as grounds for declaring a $1 billion bounty on the heads of Superman and Batman. Now, the two heroes must team up to save both the planet and their own necks. They can't do it on their own, but finding help won't be easy because every hero and villain on the planet is looking to collect that juicy bounty. Upon learning that Luthor's criminal ambition reaches well beyond the borders of North America, Superman and Batman realize that clearing their good names may be the least of their worries.