Sergeant Preston of the Yukon, Dell Comics
Challenge of the Yukon was a radio series that began on Detroit's station WXYZ (as had The Lone Ranger and The Green Hornet). 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.
The program was an adventure series about Sergeant William Preston of the North-West Mounted Police and his lead sled dog, Yukon King, as they fought evildoers in the Northern wilderness during the Gold Rush of the 1890s. In 1955, the same year the radio show ended, Sergeant Preston of the Yukon premiered as a television series (CBS, 1955-1958). Richard Simmons starred as Sgt. Preston, and it’s his image on the cover of the Dell comic books.