Last Alien Encounter is a fascinating story of ancient nomadic people who encounter giant aliens from another galaxy after The Last Ice Age. The robotic Cybermen who were sent to Earth was looking for a rare blue crystal in a remote area in North America, now called Absaroka Mountain in Montana. Every evening after sunset, they leave the confines of their spacecraft and work in a cavern. The ancient people who lived close to them revered them and called them Gods from the sky. One day they disappeared, leaving behind a rare blue crystal as a gesture-of-good-will in hopes that it might encourage intelligent humans to benefit from its powers one day.