How are the Challengers of the Unknown connected to Darkseid's death, and is there a way back from Omega? Does the most frightening unknown the Challengers have ever faced lie within? As the rift between the Challengers and the Justice League grows and becomes untenable, it's up to Rocky Davis and Wonder Woman to try to get to the heart of the matter... or die trying! But an old foe will rear its head once more -- this time aboard the Watchtower, all in an effort to use the Challengers as a means to a nefarious end. Doors close, and alliances tilt, even while other gateways open...