The year is 2104, and the Solar Union — Earth's governing body across the solar system — faces its worst crisis in decades. Three former colonies, disguising their aggression as diplomacy, launch surprise attacks and occupy three strategically vital mining worlds: Neptune's moon Triton, the Earth-like planet Romulous, and the ocean world Pacifica. Earth's continued survival depends on taking them back. The player commands the full range of Earth's military forces — ground, air, and naval — across the campaign to recapture all three.