The show was based on the exploits of clean-cut, square-jawed Rocky Jones, the best known of the Space Rangers. These were Earth-based space policemen who patrolled the United Worlds of the Solar System in the not-too-distant future. Rocky and his crew would routinely blast-off in a V-2-like chemically-fueled, upright rocketship, the Orbit Jet XV-2, or later the nearly identical Silver Moon XV-3, on missions to moons and planetoids where the odds of success seemed remote yet they would always prevail.