Ufo: | Enemy Unknown

Late-game research uncovers the truth: the invasion is being orchestrated by the , a highly advanced, psionic race that has enslaved other species to serve as their military arm. Their primary base in the solar system is located in the Cydonia region of Mars. The Final Assault: Cydonia

In the original 1994 game (released in North America as X-COM: UFO Defense ), the story unfolds through a mix of scripted events and emergent gameplay as you lead a secret paramilitary organization defending Earth from an extraterrestrial threat. The Outbreak (1998) UFO: Enemy Unknown

As the Commander, you start with basic human ballistics while fighting various alien species, such as the physically frail but psionic and the brutish Mutons . The "story" is largely driven by your research: Late-game research uncovers the truth: the invasion is