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
The story begins in 1998 following a massive spike in UFO sightings, mysterious abductions, and localized attacks. After individual nations like Japan fail to contain the threat independently, representatives from the world's most powerful nations meet secretly in Geneva on December 11, 1998. They establish the , providing it with funding, base facilities, and a mandate to identify and eliminate the alien menace. The Escalation UFO: Enemy Unknown
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) Late-game research uncovers the truth: the invasion is
You recover alien corpses and technology from crash sites to develop laser and plasma weaponry. After individual nations like Japan fail to contain