This film showcases the flight of the Mariner 10 spacecraft to Venus and Mercury is detailed in animation and photography. It features views of Mercury, as well as an animation on the origin of the solar system. Dr. Bruce C. Murray, director of the Jet Propulsion Laboratory, comments on the mission.
| Actor | Role |
|---|---|
 Vic PerrinNarrator | Narrator |
| BBruce C. MurrayDirector of the Jet Propulsion Laboratory | Director of the Jet Propulsion Laboratory |