From the award-winning creators of Civilization comes an action-strategy game about the last stand of humanity. Threatened by an unknown enemy, the governments of Earth unite to form an elite paramilitary organization called XCOM, tasked with combating this extraterrestrial attack. As the commander of XCOM, you control the global defense team in the fight against a terrifying alien invasion by establishing a fully operational base, researching alien technologies, planning combat missions, and directing the movement of soldiers in battle.