XCOM: Enemy Unknown

XCOM: Enemy Unknown is a 2012 turn-based tactics video game developed by Firaxis Games and published by 2K. It is a "reimagining" of the 1994 strategy game UFO: Enemy Unknown (also known as X-COM: UFO Defense). XCOM: Enemy Unknown is set during an alien invasion of Earth in an alternative version of 2015; the player controls an elite, multinational, paramilitary organization called XCOM and commands troops in a series of turn-based tactical missions. Between missions, the player directs the research and development of technologies from recovered alien technology and captured prisoners, expands XCOM's base of operations, manages finances, and monitors and responds to alien activity.