Villains from the rich histories of both groups hatch a insidious scheme that lays the heroes and the world they defend to waste. But of course, these are no ordinary heroes...
What started as a friendly get-together between the JLA and JSA degenerates into a destructive melee...and from the ashes emerges a villainous uber-team made up of members from each group. What's made these former heroes of virtue turn into champions of sin? And who can possibly stop them once they get really mad? Now it's up to the remaining members of both teams to save the day...but they'll have to defeat their own friends to do it!