The JSA returns in this monthly series by writer Geoff Johns and artist Mikel Janin with "Justice Society of America: The New Golden Age Part One"! The world's first and greatest superheroes return! Or do they? A long-lost hero from the JSA crashes into our era with a grave warning... but it's too late. A mysterious and malevolent enemy has invaded the entire history of the JSA, and an all-new team must come together to defeat it. But what deadly secret does this messenger from beyond keep? Where are they from? And why is all of this happening now? Only the Time Masters know...