The story follows FBI special agent William Carter who is working with the XCOM unit (Extraterrestrial Combat Unit), William is lucky enough to be given specially created weapons in order to attempt to terminate the alien threat. We are introduced to the enemies of XCOM (or some of them) which appear as a black symbiote type alien that can partner with humans (for what reason they do so we don't know yet), similar to that of Venom from Spiderman or likened to the malleable consistency of a Changeling in liquid form from Star Trek: Deep Space 9.

The player-driven, yet narrative-rich campaign progresses according to your choices and performance, while dynamic, unscripted conditions and emergent combat systems ensure that no two field operations play out the same way.

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