Most of the League battles with powerful alien nanotechnology, but realize that the waves of self-replicating robots cannot be simply destroyed. The diminutive Atom shrinks himself to stop the robots from the inside.

Batman, Wonder Woman, and Green Lantern chase Chronos to the past, where they team up with some of the greatest DC heroes of the Old West. After defeating stolen future tech in that era, they again follow Chronos to the future. Warhawk from the Batman Beyond era is revealed to be Green Lantern's and Hawkgirl's son.