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)
Once X-COM develops the (a powerful interstellar craft), they launch a final mission to Mars. UFO: Enemy Unknown
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. In the original 1994 game (released in North