Sid Meier's Alpha Centauri is a 4X turn-based strategic computer game 
created by Brian Reynolds and Sid Meier under the auspices of Firaxis
 Games in 1999. It is based on a fictional attempt by human beings to 
colonize a planet in the Alpha Centauri star system. It picks up where
 Meier and Reynolds' earlier title, Civilization II, left off. 
An expansion pack called Sid Meier's Alien Crossfire was also released. 
Although popular with gamers, the game never reached the heights of 
success of the Civilization games. Pre-patched versions of Alpha Centauri 
and Alien Crossfire were later bundled together in the Alpha Centauri Planetary Pack.