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.
Destroying the Alien Brain severs the link between the invaders and their leadership, causing the alien forces on Earth to collapse and saving humanity. UFO: Enemy Unknown
Once X-COM develops the (a powerful interstellar craft), they launch a final mission to Mars. You discover that alien technology relies on Elerium-115
The story continues in X-COM: Terror from the Deep , where a second wave of aliens awakens from the ocean floor. The story continues in X-COM: Terror from the
If X-COM goes bankrupt, loses all its bases, or fails the Mars mission, the Council of Funding Nations surrenders. In the PlayStation version's defeat cutscene, the aliens violently murder the negotiator sent to discuss terms. Legacy and Continuity
Interrogating high-ranking alien captives reveals that the various species are being manipulated by a master race. The Revelation
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)