The Planetary Pack combines the highly rated Alpha Centauri and its official expansion pack, Alien Crossfire. As a bonus, each package includes a free Prima strategy guide. With Alpha Centauri Planetary Pack, legendary designer Sid Meier presents the next evolution in strategy games, with the most addictive, compelling game play yet. Explore the alien planet and uncover its myriad mysteries. Discover new technologies and build dozens of bases as you spread your futuristic empire across the alien planet you now call home. Trade technology, wealth, or information with neighboring civilizations or new alien inhabitants to strengthen your empire–but war may be a quicker means to an end.