June 12, 1947: Radio series ‘ Sergeant Preston of The Yukon ’ made its debut and remained on air until 1955. It featured Canadian Mounted and his faithful dog King. The show first began on 3 February 1938 on Detroit’s WXYZ as was The Lone Ranger and The Green Hornet . Preston was developed by Fran Striker and George W. Trendle. "Sergeant Preston of the Yukon," which had the original title " Challenge of the Yukon ," was an adventure series that featured Sergeant William Preston and his dog called Yukon King. The new title was given in November 1951, and used until the show's last radio and TV episode. Preston's ally Yukon King was said to be the real star of the show, since he was actually able to do more work than his master.