After a cosmic prison break, twenty million murderous aliens are set free, and planet Earth is directly in their path. Unfortunately, the only one who can stop the aliens, a robotic police officer with superhuman powers and an unwavering devotion to justice, has been decapitated. Sadamitsu, a local gang member and thug, takes up the robot’s mission and his head. Wearing it as a helmet, Sadamitsu borrows the robot’s powers and fights the aliens to save the human race.