Halo: Combat Evolved. Humankind is fighting a losing battle against a powerful fellowship of alien races known as the Covenant. 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 guerilla war against the Covenant. Fight for humanity against an alien onslaught as you race to uncover the mysteries of Halo.