Aliens: Colonial Marines is a 2013 first-person shooter developed by Gearbox Software and published by Sega for PlayStation 3, Windows, and Xbox 360. Based on the Alien universe and set shortly after the events of James Cameron's 1986 film Aliens, the game follows a group of Colonial Marines, a fictional military unit, as they confront the Weyland-Yutani corporation in an effort to rescue survivors from the Sulaco spaceship. The game features a campaign mode that supports both single-player and cooperative gameplay, and a multiplayer mode in which players compete in different scenarios.

Gearbox Software is an American video game development company based in Frisco, Texas. It was established as a limited liability company in February 1999 by five developers formerly of Rebel Boat Rocker. Randy Pitchford, one of the founders, serves as president and chief executive officer. Gearbox initially created expansions for the Valve game Half-Life, then ported that game and others to console platforms. In 2005, Gearbox launched its first independent set of games, Brothers in Arms, on console and mobile devices. It became their flagship franchise and spun off a comic book series, television documentary, books, and action figures. Their second original game series, Borderlands, commenced in 2009, and by 2015 had sold over 26 million copies. The company also owns the intellectual property of Duke Nukem and Homeworld.