Okay, i've talked a bit about this, it's basically a typical elseworld that explores how the lives of our charactes might be in the future.
In this case, it's about five to ten years from now, most of the great heroes of today have allowed the new heroes to succeed them, because of this, the Justice League is now mostly populated with the former ranks of Teen Titans and Young Justice.
They're stepping in to some big shoes...think they can fill them?