Only those who live at the edges of the world have a margin of freedom. Now the aliens rule Earth, building shining cities that promise a brilliant future for humanity on the surface, while concealing a sinister agenda below and eliminating all who dissent from their new order. XCOM 2 Website Twenty years have passed since world leaders offered an unconditional surrender to alien forces and XCOM, the planet's last line of defense, was left decimated and scattered. Richard Tygan Scientists Research Projects. XCOM 2 Wiki will guide you with all information on weapons, armor, maps, tactics, abilities, walkthroughs and more! Sign In Help Sign Out.