Work on this episode resumed after the attack and kidnapping suffered by Alberto Angela and the Ulisse crew by a group of armed men in the Niger desert. Only part of the footage was saved and the episode will begin from these images, that is, from the Sahara, the largest desert in the world. We will also see some shots of the last camp before the kidnapping. The program will take us to the most extraordinary deserts in the world: from Libya to Peru, from Namibia to the Egyptian desert. These lunar landscapes, devoid of life, actually hide many precious things: diamonds, finds from ancient civilizations, mummies, cave paintings, prehistoric tools. And also life forms that manage to survive in extreme conditions: in some cases even lions and elephants. Alberto Angela will visit the highest dunes and incredible rock formations of the Sahara, inhabited millennia ago by ancient populations, when instead of the desert there were rivers and lakes.