Double Dragon is the story of two twin brothers, Billy and Jimmy Lee, facing the odds together in a city where survival has to be learned the hard way. Their knowledge of the martial arts, combined with the experience of tough urban existence, has made them both formidable fighting machines, ready for any challenge that comes their way.

But now the brothers are faced with their greatest challenge ever. Billy's girl Marian has been kidnapped by the Black Warriors, a savage and ruthless street gang led by the mysterious Shadow Boss. Using skills gained from a lifetime on the streets, and whatever weapons come to hand - including knives, whips, baseball bats, rocks, and even oil-drums - Billy and Jimmy must pursue the gang through the sprawling slums, factories and outskirts of the city, to reach the thugs' hideout for a final confrontation with the infamous Shadow Boss!