A time-honored tradition is updated - and upgraded - for a new generation of heroes! The World's Greatest Heroes (the JLA) and the Original Super-Team (the JSA) have teamed up to save the world again and again in times of crisis. This year, the two groups engage in a world-shaking adventure that results in an all-out slugfest - so colossal that only a 96-page hardcover can contain it! Acclaimed writers David S. Goyer (JSA) and Geoff Johns (THE FLASH, Avengers) combine with the powerhouse art team of Carlos Pacheco and Jesus Merino (Avengers Forever, Fantastic Four) for a tale with real, dramatic impact on the lives of the two popular super-hero teams. Villains from the rich histories of both groups hatch an insidious scheme that lays waste the heroes and the world they defend. But of course, these are no ordinary heroes... What starts as a friendly get-together between the JLA and JSA degenerates into a destructive melee...and from the ashes rises a villainous uber-team made up of select members from each team. What's made these heroes of virtue turn into agents of vice? And who can possibly stop them once they get really mad? It's up to the remaining members of both teams to save the day. But they'll have to defeat their friends to do it! 96-page hardcover