Colony 7

Colony 7 is a shooter game by Taito Corporation released in 1981 that is in many ways a combination of the two most popular shooter games of the time. Containing both elements of Taito's own Space Invaders and Atari's Missile Command. This game has recently been re-released by Sega on their game compilation Taito Legends. A homebrew version of Colony 7 for the Atari 2600 was released by AtariAge in 2008.