Double Dragon is a seminal beat 'em up video game developed by Technōs Japan and released in 1987. The MS-DOS version brought the arcade experience to home computers, allowing players to engage in side-scrolling combat as martial artists Billy and Jimmy Lee. Their mission: rescue Billy's girlfriend, Marian, from the Black Warriors gang. The game is renowned for its cooperative two-player mode and the ability to use enemy weapons, setting a standard for the genre.