The Iron Masked Party, lead by Dr. Devilar, steals giant robots built all over the world from an exhibition and kidnap their creators to form a "Robot Empire". Scientist Kenichiro Kurenai, foreseeing his capture, turns over his own super robot, Red Baron, to his younger brother Ken Kureinai. Ken is a member of SSI (Secret Science Investigation), a highly skill team of scientists that practice ninjitsu, and uses Red Baron to aid the team in their efforts to stop the Iron Masked Party from taking over the world.