
Billy becomes the new Dragon Master of the Dragon Dojo and meets his twin brother, Jimmy. When Jimmy goes missing, Billy calls upon his Dragon birthmark to lead him to his brother. Billy then faces off against the Shadow Boss and discovers that he is none other than Jimmy.
The Shadow Master appears for the first time and orders Jimmy to retrieve his twin brother and the Dragon Sword. Jimmy kidnaps Billy, but fails to retrieve his sword. The Shadow Master then attempts to get rid of both the brothers, but the brothers escape and Jimmy changes sides, joining Billy. Billy and Jimmy become the Double Dragons and face off against the Shadow Master at the EMF plant.