On the run and out of allies, Captain Atom is forced to take a desperate step into his own past in search of assistance. At the same time, Ray and Ryan's latest experiment puts them at odds and could lead to disastrous consequences for all those onboard the Watchtower. As the metahuman arms race with the terrorist group known as INFERNO escalates, descent in the ranks of the Justice League's Atom Project must be quelled before catastrophe overtakes the planet!