XCOM: Enemy Within is a standalone expansion to the 2012 Game of the Year award-winning strategy game XCOM: Enemy Unknown. This all-in-one package features the core experience of XCOM: Enemy Unknown plus even more content, including all-new soldiers and abilities, enemy threats, maps and missions, and multiplayer content providing a fresh new gameplay experience. Also included is the Elite Soldier Pack, plus the Slingshot and Second Wave add-on content.
Threatened by an unknown enemy, Earth?s governments unite to form a secret paramilitary organization, known as XCOM, to combat this extraterrestrial attack. As the commander of XCOM, you control the global defense team and its resources in a battle against the terrifying alien invasion. You control the fate of the human race by creating and managing a fully operational base, researching alien technologies, planning combat missions, and controlling soldier movement in battle.
* Does not require the purchase of XCOM: Enemy Unknown