UFO: Alien Invasion is a game in which the player controls human special forces (PHALANX) in the fight against alien invaders. It is an opensource game based on and heavily influenced by the X-COM games.

UFO: Alien Invasion is a game in which the player controls human special forces (PHALANX) in the fight against alien invaders. It is an opensource game based on and heavily influenced by the X-COM games.