Sergeant Preston of the Yukon is an American action adventure northwestern television series based on the radio drama Challenge of the Yukon. It was initially broadcast in color on CBS across three seasons from September 29, 1955 to September 25, 1958. Richard Simmons stars as Sergeant William Preston, who patrols the Yukon Territory in search of renegades and outlaws, during the time of the Klondike Gold Rush of the 1890s.