The original X-COM game, known as UFO Defense in North America, was released, laying the foundation for the franchise.
Firaxis Games released X-COM: Enemy Unknown, a reboot of the X-COM series, to critical acclaim.
X-COM 2, the turn-based tactics game and sequel to X-COM: Enemy Unknown, was released for PC.
The 'War of the Chosen' expansion for X-COM 2 was released, enhancing gameplay with new factions, enemies, and missions.