Erich von Daniken spends two episodes revisiting the sites that made his ancient-astronaut theory famous, arguing that Bronze Age and pre-Columbian builders had help they couldn't have produced alone. The first episode takes him to Peru's Nazca plateau, where he reads the geoglyphs not as ritual art but as markers for a communication system aimed at the sky, and then to Giza, where he points to the precision of the pyramid's stonework and the Sphinx as evidence of tools beyond what dynastic Egypt is credited with. The second episode moves to Mexico and Central America: Teotihuacan's pyramids, the Maya city of Palenque, and the Olmec site of La Venta, each offered as another data point in the same argument. Von Daniken narrates on location at every stop, making his case directly to camera rather than through outside experts. Mainstream archaeologists reject the ancient-astronaut reading of all these sites, and the film doesn't pretend otherwise; it's von Daniken's theory, presented in his own voice, site by site.