XCOM ON THE RUN: Take command of the Avenger, an alien supply craft converted to XCOM's mobile headquarters. RECRUIT RESISTANCE FIGHTERS: Five soldier classes, each with its own skill tree, let you create specific soldiers for your tactical plan. TACTICAL GUERRILLA COMBAT: New gameplay systems offer more tactical flexibility in combat. A NEW BREED OF ENEMY: A diverse cast of enemies from powerful new alien species to the ADVENT, enforcers of the alien regime, offer a distinct tactical challenge. RESEARCH, DEVELOP AND UPGRADE: Configure and build rooms on the Avenger to give XCOM new capabilities on the battlefield.