- An evil secret society called Sigma kidnaps Japan's political and business leaders, to harvest DNA for the creation of their Ultimate Weapon. Sigma's only serious opponent: secret agent Yutaka Daimon (Yasuhisa Furuhara) with his faithful robot motorcycle sidekick Zaborgar. Daimon has a personal vendetta against Sigma as they killed his father, but he starts doubting his mission when the people he protects turn out to be cowardly and corrupt. Disaster strikes when Daimon starts to have romantic feelings for Miss Borg (Mami Yamasaki), a sexy cyborg agent from Sigma, leading to a split between Daimon and Zaborgar.
Twenty-five years later, the now-disgraced Daimon (Itsuji Itao) has been reduced to working as a chauffeur for corrupt Prime Minister Wakasugi. But Sigma, having at last finished its giant robot, is now preparing to unleash it upon the world. With no one left to oppose them, a worn, middle-aged Daimon is forced out of retirement and into service as a crime-fighter one last time. But will Zaborgar forgive and forget, and aid Daimon in his quest to maintain righteousness and save the world from total destruction?