Halo: Combat Evolved
Bent on humankind's extermination, a powerful fellowship of alien races known as the Covenant is wiping out the Earth's fledgling interstellar empire. You and the other surviving defenders of a devastated colony-world make a desperate attempt to lure the alien fleet away from Earth. Shot down and marooned on the ancient ring-world Halo, you begin a guerrilla war against the Covenant. Fight for humanity against an alien onslaught as you race to uncover the mysteries of Halo.
http://download.cnet.com/Halo-Combat-Evolved/3000-7441_4-10235611.html
