After Abaddon, who dreamed of conquering Earth, is defeated by the justice warrior Half-Moon, his brother Adolf (played by Kim Ki-joo) appears on Earth for revenge. However, they have no way to capture the mysterious Half-Moon. To lure Half-Moon, they take Police Chief Na's wife (played by Kim Myung-deok) hostage. Sensing this, Half-Moon tries to defeat the villains, but Adolf is so strong that he merges with the female Half-Moon to become the Half-Moon robot. He defeats all his subordinates but is defeated by Adolf. A young Half-Moon (played by Kim Dong-wook) then appears to help, but the two Half-Moon warriors fall powerless.