You discover that alien technology relies on Elerium-115 , a stable heavy element not found on Earth, which becomes the most vital resource for humanity's advanced crafts and weapons.
Soldiers must fight through the Martian surface and into the underground alien complex. UFO: Enemy Unknown
Interrogating high-ranking alien captives reveals that the various species are being manipulated by a master race. The Revelation You discover that alien technology relies on Elerium-115
The modern XCOM: Enemy Unknown reboots this story for a new timeline. In the timeline of XCOM 2 , it is revealed that X-COM actually lost the war early on, and the "victory" from the previous game was a simulation run in the Commander's mind while they were held captive. The Revelation The modern XCOM: Enemy Unknown reboots
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
Destroying the Alien Brain severs the link between the invaders and their leadership, causing the alien forces on Earth to collapse and saving humanity.
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