Double Dragon is the story of Billy Lee, Dragonmaster. Billy's parents are attacked by Shadow Warriors, who steal away Billy's twin brother, and Billy is taken to Metro City's Dragon Dojo by his father, John Lee, to be raised by the Oldest Dragon. Trained from infancy in the marital arts and steeped in the non-violent Code of The Dragon, Billy is appointed as the new Dragonmaster by the Oldest Dragon. A new Shadowboss takes command of the Shadow Warriors and escalates his campaign of terror. Billy helps Marion, a young policewoman, in her battle to stop the Shadow Warriors, and meets Jimmy Lee, the identical twin he's never known. When Marian and Jimmy are captured, Billy attempts to rescue them. There, the Shadowboss' secret identity is finally revealed - it is Jimmy behind the mask.