When terrorist groups, evil criminals and aliens become too strong even for Earth's over-stretched armed forces, the virtually-indestructible robot, Gigantor, is built to combat them.When terrorist groups, evil criminals and aliens become too strong even for Earth's over-stretched armed forces, the virtually-indestructible robot, Gigantor, is built to combat them.When terrorist groups, evil criminals and aliens become too strong even for Earth's over-stretched armed forces, the virtually-indestructible robot, Gigantor, is built to combat them.