The Pyramid at the End of the World

At a war zone in Turmezistan where American, Chinese, and Russian armies are about to meet, a 5,000-year-old pyramid stands. It's very strange, but one thing raises the suspicions of the United Nations: it just appeared overnight. The aliens inside claim that humans would cause the death of all life on Earth. Soon, the Twelfth Doctor, Bill and Nardole are facing an invasion the likes of which they have never seen before. Before they invade, the aliens need the permission of humanity.