Heiankyo Alien (????????, Heian-ky? Eirian) is a video game created by the University of Tokyo's Theoretical Science Group (TSG) in 1979. The game was originally developed and released as a personal computer game in 1979, and was then published by Denki Onky? Corporation (????????, Denki Onky? Kabushiki Gaisha) as an arcade game in May 1980. The game has been ported to several other gaming systems since its original release.