The new Justice League of America is here—and now, in these stories from issues #1-6 of the new series, they're going to meet the Extremists—self-proclaimed saviors from another Earth, they thirst for peace, prosperity and total submission to the will of their leader, Lord Havok! How can the newly assembled JLA stop this group of misguided maniacs before the Extremists unleash their own unique—and dangerous—brand of law and order on our chaotic world?