The radio show Perry Mason, based on the novels of Erle Stanley Gardner, was broadcast on CBS Radio from 1943-1955. The series was adapted into Edge of Night which ran on television for an additional 30 years.
Gardner's literary success with the Perry Mason novels convinced Hollywood to try its hand, unsuccessfully, with some motion pictures. However, the Perry Mason radio show stayed on the air for 12 years. The radio series was geared more towards action than courtroom drama.
As Edge of Night (EON), it ran for another 30 years on television, but Gardner disliked the proposed daytime television version due to a lack of his own creative control, withholding his endorsement thus forcing the subsequent name change.
The actors portraying Mason switched frequently over the first three years, starting with Bartlett Robinson, followed by Santos Ortega and Donald Briggs, before settling on John Larkin, who played the famous attorney for the remainder of the broadcast, as well as the equivalent character on EON. Della Street, was portrayed by radio soap queens; Gertrude Warner, Jan Miner (Palmolive's "Madge" the Manicurist) and Joan Alexander (radio's Lois Lane).
Radio's Mason has more in common with the daytime television serial The Edge of Night than the prime time Perry Mason television show. Gardner disagreed with the direction of the new television show and pulled his support. The sponsor, Procter & Gamble hired the writers and staff of the Perry Mason radio series, the show was retooled, and became The Edge of Night. Erle Stanley Gardner eventually aligned himself with the nighttime courtroom drama. (source:wikipedia)