XCOM begins in the spring of 2015, as a global alien invasion begins. Prior to the start of the story, a group of countries called the Council of Nations has banded together to create XCOM (short for Extraterrestrial Combat Unit), the most elite military and scientific organization in human history, tasked with defending them from the alien attack. XCOM proceeds to engage in a war against an extraterrestrial enemy with overwhelming technological superiority.
Yic / Julinna / Leyka / Ken / Miola / Khris / Laeda / Aedan / Glayton / Rey Shepard / Sofia Shepard / Iko
Jack / Kaiden / James Vega / Leliana / Isabela / Cassandra / Aela / Sousuke / Motoko / Rita Vrataski / Barney Ross / Lee Christmas