UFO: Aftershock

It's the year 2054. Fifty years after the events of UFO: Aftermath, when aliens turned Earth into a giant experimental laboratory. The human race survives on a giant flying island called Laputa. A rebellion against the island's strict and corrupt rulers escalates into a conflict that unhappily destroys the island. The survivors were once again forced to find a new home. Will they be able to reclaim Earth, now controlled by unknown forces?