UFO: Aftershock is a combination of tactical squad combat and global strategy that enhances and expands upon its prequel, UFO: Aftermath.

It is the year 2054. Fifty years after the disaster. Fifty years after the surface of Earth became uninhabitable. Retreating to the flying haven of the Laputa the remnants of humankind clung onto existence. Then a revolt against the increasingly rigid and corrupt human leadership of the Laputa escalated into a conflict that destroyed the colony. Now, the remaining survivors flee once again. Can they reclaim the Earth from the unknown forces that chased them into the skies?