NASA's Voyager mission began as a single opportunity: a rare planetary alignment in the late 1970s that let two spacecraft visit all four outer planets in one grand tour, an idea the mission's engineers and scientists started sketching in the early 1970s. The people who built and flew Voyager narrate their own story here, walking through the mission's design, the years of waiting between planetary encounters, and the ongoing hunt for the heliopause, the boundary where the Sun's solar wind gives way to interstellar space. Their footage and commentary cover the discoveries as they happened: new moons and rings found around Jupiter, Saturn, Uranus, and Neptune, the first close images of these planets and their icy satellites, active volcanoes erupting on Jupiter's moon Io, and evidence of a subsurface ocean beneath the ice of Europa. Told firsthand by the team rather than through later retrospection, the film stays close to what Voyager's instruments actually returned and what it meant to the scientists reading the data in real time.