Set in a post-apocalyptic New York, Double Dragon is the story of Billy and Jimmy Lee, twin brothers trained in the fighting style of Sou-Setsu-Ken. Together, they manage a small martial arts training school, teaching their students in self-defense. One day, Billy's girlfriend, Marian, is kidnapped off the street by the "Black Warriors", a savage street gang led by a man named Willy. The Black Warriors demand the Lee brothers disclose their martial arts secrets in exchange for Marian's freedom. The Lee brothers set out on a rescue mission to crush the Black Warriors and save Marian.
Using whatever techniques they have at their disposal, from basic punches and kicks to invulnerable elbow strikes, as well any weapon that comes into their hands, the Lee brothers must pursue the gang through the city slum, industrial area, and forest before reaching their hideout to confront the big boss, Willy.
The Commodore 64 version of this game also has a VS. fighting mode for one or two players. Players choose from six different characters (Billy and five of the enemy characters) and enter into a one-on-one fighting match. Players have to punch, kick, jumpkick, and even use a weapon against their opponents until someone's health bar is fully drained. The winner is the last one standing.