Double Dragon is a classic beat 'em up video game series that first debuted in 1987. Developed by Technōs Japan, it features two martial artist brothers, Billy Lee and Jimmy Lee, who fight against various enemies to rescue a kidnapped woman named Marian. The game is known for its cooperative gameplay, allowing two players to team up and battle through levels filled with thugs and bosses. The original game was groundbreaking for its time, introducing elements like a storyline and character progression. It spawned several sequels and adaptations, including arcade versions, home console releases, and even a live-action movie. Double Dragon remains a significant part of gaming history, influencing many subsequent beat 'em up titles.