Ten years ago, Doctor Shizuma invented an environment friendly energy system that was to save the planet from ecological ruin, but now he finds himself being pursued by a mysterious organisation who want the attache case he is carrying with him. They are about to catch him when Giant Robo and the Experts of Justice intervene to stop the case falling into the hands of the villainous Magnificent Ten.

Genya returns to Big Fire's secret headquarters with a new plan to put a cessation to the hostilities once and for all. As the surviving Experts of Justice regroup and nurse their injuries, they learn that neither Giant Robo or Agent Gineri are now trusted by Interpol. The Expert's resources are now truly stretched to breaking point, especially after the final attack on Saint Abbe.