The Challengers continue to investigate the after effects of the Darkseid shockwave. The latest mission draws Prof Haley along with Ray Palmer (The Atom) to a remote and far-reaching part of the world where hyper-intelligence seems to have infected a long-missing individual from DC Comics past. Things turn even stranger when a being appears to Prof and the Atom claiming to be from the future and calling itself THE OPTIMUM. The Optimum promises untold scientific secrets... that is, if it could have a glimpse into the Justice League's top secret Atom Project...