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.

Peking is under attack from the fearsome Lord Alberto. Kenji Murasame prepares his ultimate weapon and the Experts of Justice are trapped behind the Big Fire's force field, powerless to intervene in what could amount to a new dark age.

Emmanuelle acquires the third sample, prompting both Chief Chujo and agent Ginrei to prepare for the ultimate sacrifice.