The final stages of the Apollo 11 mission, following in real time the recordings of Neil Armstrong and Buzz Aldrin negotiating the final descent to the lunar surface, while Michael Collins remains in lunar orbit, uncertain if they will be successful or if he will be left to return to Earth alone. The programme features footage from the two astronauts' cameras, including the positioning of the American flag, as well as their call to President Nixon. It also follows the perilous return journey to Earth.