After sweeping Dallas Gordon and the American base from Earth’s moon, Emperor Zhang Aiguo launches an armada to conquer Ep City and control Mars. Ruthless Colonel Song Dajing leads his Emperor’s flotilla to defeat EPSILON’s isolated Mars colony. He brings the same armaments he used to defeat Dallas Gordon on the moon, plus a high yield missile to annihilate Ep City and its occupants. The US Space Force, occupied with plans to take back the moon, refuses to intervene. In a race against time, Dallas Gordon must organize a mercenary squadron and pursue Song before he can deploy his weapons on the defenseless colony. Ep City commander Genady Antonov must prepare his civilian workforce for the coming invasion and plan for the unthinkable should Gordon fail to reach Mars before Song.