UFO: Alien Invasion 2.5

UFO: Alien Invasion is a squad-based tactical
strategy game in the tradition of the old X-COM PC
games, but with a twist. This game combines
military realism with hard science-fiction and the
weirdness of an alien invasion. The carefully
constructed turn-based system gives you pin-point
control of your squad while maintaining a sense of
pace and danger. The story is set in the year
2084. You control a secret organization charged
with defending Earth from a brutal alien enemy.