Doctor Mist, an ancient mystic with power beyond understanding, appears before the Justice League of America to team them up with the Global Guardians in order to face super-villains acting on behalf of the equally ancient Conqueror! But even as the two teams work together to stop these henchmen from completing their tasks, are the heroes merely being distracted from the Conqueror’s true goals? Meanwhile, Green Arrow confronts Doctor Mist over why the most powerful man on Earth needs agents to do his work!