Challenge of the Yukon was a radio series that began on Detroit's station WXYT and was an example of a Northern genre story. The series was first heard on February 3, 1938. The title changed from Challenge of the Yukon to Sergeant Preston of the Yukon in November 1951, and remained under that name through the end of the series and into television.
Following the success of The Lone Ranger and The Green Hornet on Detroit radio station WXYZ (now known as WXYT), the station owner, George W. Trendle, asked for a similar adventure show with a working dog as the hero. Writer Tom Dougall, who had been influenced by the poems of Robert W. Service, naturally chose a Husky. The dog was called King. Dougall likewise created Sgt. Preston and the French-Canadian guide. Fran Striker, who also wrote for The Lone Ranger, contributed show scripts.
Challenge of the Yukon began as a 15-minute serial, airing locally from 1938 until May 28, 1947. Shortly thereafter, the program acquired a sponsor, Quaker Oats, and the series, in a half-hour format, moved to the networks. The program aired on ABC from June 12, 1947, to December 30, 1949. It was then heard on The Mutual Broadcasting System from January 2, 1950, through the final broadcast on June 9, 1955. In November 1951, the title was changed to Sergeant Preston of the Yukon. (Source: wikipedia)