Aliens: Colonial Marines is a first person shooter from Sega and Gearbox Software that takes place after the film Aliens. Gamers, as space marines, investigate a host of creepy locales, fending off alien attacks using signature weapons from the movie, such as a pulse rifle and smart gun. With four-player online co-op, terrifying visuals and plenty of scares, Aliens: Colonial Marines could be the ultimate survival horror experience.