Sid Meier's Alpha Centauri™ Planetary Pack includes the original Alpha Centauri and the expansion, Alien Crossfire.

Mankind begins its most monumental task: the colonization of space. A crew of internationally renowned scientists and security strategists, with wide-ranging convictions and diverse ethics, embarks on a mission that will change the world. One Planet. Seven unique factions. Which will you lead? Each faction has its own agenda, each leader a final goal. You must play to each strength and exploit each hidden weakness in your quest to rule the future. 

Key features: 

• Great spin-off of the legendary Civilization series, in a refreshing sci-fi setting
• Design your own units. Balance their speed, power, and toughness to suit your current tactical needs
• Seven factions to chose from, each with its own artificial intelligence model that creates a very suggestive feeling that you’re up against real people