Shizuma, a scientist, with his four colleagues, invented the Shizuma drive near Belgium ten years before the events of the Giant Robo story. The drive was the perfect energy source, efficient and non-polluting, and soon everything in the world, from airplanes to cigarette lighters to giant robots, used it. Dr. Shizuma was hailed as a hero, but at the start of the anime he is a nervous wreck and mentally unstable. It seems he knows something about the Shizuma drive that the rest of the world does not.