The TV series “Gunsmoke” ran from September 10, 1955 to March 31, 1975 on
CBS with 635 total episodes. The first twelve seasons aired Saturdays at 10:00,
seasons thirteen through sixteen aired Mondays at 7:30 and the last four seasons
aired Mondays at 8:00. It is the longest running, prime time series of the 20th
century. Today, it still has the highest number of scripted episodes for any, U.S. primetime, commercial live-action television series. The series began on radio,
aired from April 26, 1952 until June 18, 1961 on CBS. It starred William Conrad
as the main character, Marshal Matt Dillon.

Introduction of the first episode of “Gunsmoke” by John Wayne