Aliens ROM Download for Atari 800 on Emulator Games. Play Aliens game that is available in the United States of America (USA) version only on this website. Aliens is a Atari 800 emulator game that you can download to your computer or play online within your browser. You can also download free ROMs such as Aliens - Thanatos Encounter, Aliens 3 and Roswell Conspiracies - Aliens, Myths & Legends as shown below. Aliens works on all your devices in high quality.