[1] Film star Joel McCrea voiced the radio version as the fictitious Texas Ranger Jace Pearson, who uses the latest scientific techniques to identify criminals.

But in the television version, Willard Parker assumed the role of Jace Pearson and had a regular partner, Ranger Clay Morgan, who had been an occasional character on the radio show.

William Boyett appeared five times on the television series, including the role of Wade Crowell in the 1955 premiere episode, "Ransom Flight."

The radio series used contemporary cases and modern detective methods to solve crimes; it was a procedural drama, in many ways Jack Webb's Dragnet with a Western flavor.

The television version had some episodes set in the 1950s, comparable in some ways to Rod Cameron's syndicated series, State Trooper.