James May marks the 40th anniversary of the Apollo moon landings by tracing the story from the early space race through the Apollo program to present-day plans for a return to the Moon. He talks with veterans of the Apollo missions and with scientists and engineers who worked on the technology that got them there, pairing their accounts with archival footage of launches, mission control, and the lunar surface. May's approach leans on demonstration rather than jargon: he uses props, mock-ups, and plain comparisons to walk through how a Saturn V engine works, what a lunar module actually had to do, and why the navigation math of the 1960s was so difficult to pull off with the computing power available at the time. The film treats the astronauts and engineers as the story's real subject, letting their firsthand descriptions of the missions carry most of the historical weight, while May's own curiosity supplies the throughline connecting Cold War ambition to the current push to go back.