UFOS?
Alien speciesIn addition to the aliens familiar from XCOM: Enemy Unknown, you'll have to face horrific beasts such as Archons, Andromedons, Berserkers, Chrysalids, Faceless, Mutons, Sectoids, snake-like Vipers, and the zombie-like Lost. Mobile Base - The Avenger, a former alien supply ship, is your team's mobile base of operations that is safe and can go anywhere.