In September of 1939, a new voice of the Shadow appeared in the form of radio actor Bill Johnstone. Later in 1939, Agnes Moorehead left the show and was replaced by Marjorie Anderson as Margo Lane. The plot lines began to follow the standard formula of Margo Lane being in danger and the Shadow rescuing her from the clutches of evil. Bill Johnstone would be the voice of the Shadow for five seasons, until March 1943. Bret Morrison took over the Shadow role in 1943 for one season. John Archer and Steve Courtleigh took the Shadow role through the 1944-45 season. Bret Morrison then returned to be the Shadow for the duration of the program's run which lasted until December 26, 1954.