Ranger Bill, Warrior of the Woodland, struggling against extreme odds, traveling dangerous trails, fighting the many enemies of nature. This is the job of the guardian of the forest, Ranger Bill. Pouring rain, freezing cold, blistering heat, snows, floods, bears, rattlesnakes, mountain lions. Yes, all this in exchange for the satisfaction and pride of a job well done." That was the opening of Ranger Bill, a Christian radio adventure serial produced under the auspices of the Moody Broadcasting Network and the Moody Bible Institute.

There were 206 episodes of Ranger Bill, which ran from 1950 to 1954 in a 15-minute format on WMBI in Chicago, and in syndication as a 30-minute show from 1954 to 1962. The series followed the adventures of Park Ranger Bill Jefferson. Miron Canaday starred as Bill, the chief forest ranger in the small Rocky Mountain town of Knotty Pine, where the former US Marine lived with his mother.

Ranger Bill was your standard radio hero, a paragon of fitness and virtue who could resolve nearly any situation. Ranger Bill and his friends were faced with many situations to solve over the years, from the mundane, like finding lost kids or investigating the problems racing boats were causing on the lake, to the fantastic, including several elephant attacks, spacemen apparently coming from a meteor and trying to find a lost treasure in the Amazon, all the while stressing positive Christian values for young people.