Payback.Van Kleiss and the Pack orchestrate a massive coordinated attack on all major Providence facilities on Earth, with Van Kleiss himself targeting the Keep, the aerial flagship of Providence. Rex, Noah, and Bobo attempt to stop Van Kleiss from taking over the Keep, but Van Kleiss captures Rex, revealing that some of Rex's nanites were left behind when he cured him, giving him knowledge of Rex's abilities. Van Kleiss then steals all of Rex's active nanites, restoring Van Kleiss's EVO abilities leaving Rex powerless. Van Kleiss's lieutenant Biowulf throws Rex out of the Keep, but Rex is narrowly rescued by Holiday. Van Kleiss then discovers that Rex's nanites have given him the ability to turn living things into EVOs, and he proceeds to mutate all of the Keep's crew, including Captain Calan. At the Providence HQ, Holiday discovers that Rex still has one active nanite - the Omega-1 nanite which Rylander injected him with. Van Kleiss then rams the Keep into Providence HQ, and his EVOs swarm it. In a desperate move, Rex travels to Purgatory Base and fills himself with his own excess nanites, activating them using the Omega-1. This not only restores Rex's powers, but gives him the ability to generate new machine builds. Rex returns to HQ and helps Six defeat Van Kleiss, who flees, with Rex choosing not to pursue him. The Providence agents are cured, and Rex expresses confidence that Providence can defeat Van Kleiss in his EVO war.