Sid Meier's Alien Crossfire, published in September 1999, is an expansion pack for Sid Meier's Alpha Centauri, a turn-based strategic 4X computer game. It was designed by Timothy Train and other members of Firaxis Games. Alien Crossfire features seven new factions (two of which are non-human), new technologies, new facilities, new secret projects, new alien life forms, new unit special abilities, new victory conditions (including the new Progenitor Victory) and several additional new concepts and strategies. The game initially had a single production run. The editable nature of the game allows for a large degree of customization and has led to the creation of a number of mods and custom factions which other users can download to expand the gameplay. A number of sites have sprung up to support and distribute these files. Brendan Casey (scient) released Version 1.0 of the Unofficial SMAC/X Patch, which fixes some bugs in Alien Crossfire on May 7, 2010. His project began in February 2009 at Apolyton's Alpha Centauri site and moved in June 2009 to the Civilization Gaming Network, where he will continue developing further versions of the patch. Electronic Arts included both Alpha [ - ]

Sid Meier's Alien Crossfire, published in September 1999, is an expansion pack for Sid Meier's... [ + ]