Richard Simmons starred as Sergeant Preston, who patrolled the Yukon Territory in search of renegades and outlaws, during the time of the Klondike Gold Rush of the 1890s.Tim Brooks and Earle Marsh, The Complete Directory to Prime Time Network and Cable TV Shows 1946 – Present, 1st Edition, pages 553 - 554, Ballantine Books, 1979 In every episode, Preston was assisted by his Alaskan Malamute Yukon King, who had been raised by a female wolf. In episodes taking place during the summer he rode his horse Rex.Ken Beck & Jim Clark, The Encyclopedia of TV Pets (ebook), Thomas Nelson, 2002
