Y-COM and X-COM, two agencies created for very different purposes. In 2004 Y-COM Fell due to the hands of KayzarCore. Y-COM reformed in 2014, and they soon eliminated KayzarCore. A year later the aliens revealed themselves and Y-COM joined forces with X-COM as part of a secret soldier program. Now, it's up to the soldiers of X-COM and the agents of Y-COM to save the world.