Dastardly and Muttley in Their Flying Machines is a cartoon produced by Hanna-Barbera Productions for CBS. Originally the series was broadcast as a Saturday morning cartoon, airing from September 13, 1969 to January 3, 1970. The show focuses on the efforts of Dick Dastardly and his canine sidekick Muttley to catch Yankee Doodle Pigeon, a carrier pigeon who carries secret messages. The cartoon was a combination of Red Baron-era Snoopy, Wacky Races, and the film Those Magnificent Men in Their Flying Machines. The show is widely known as Stop that Pigeon based on the show's original working title and the show's theme song, written by William Hanna and Joseph Barbera which repeats that phrase so often that it is frequently mistaken as the show's actual title. In the UK, the series remains best known by the shorter name Dastardly and Muttley. The show had only two voice actors: Paul Winchell as Dick Dastardly and the indistinctly heard General, and Don Messick as everybody else. Each 22-minute show was broadcast over half an hour on the network, including network breaks, and contained: two Dastardly & Muttley stories, one Magnificent Muttley story, and two or three short Wing Dings.