Perry Mason is a radio crime serial based on the novels of Erle Stanley Gardner. The series primarily focused on action rather than courtroom drama, blending elements of mystery and soap opera. The show's protagonist, attorney Perry Mason, was often depicted engaging in shootouts with criminals rather than spending time in the courtroom. The series featured a variety of actors in the leading role, including Bartlett Robinson, Santos Ortega, and Donald Briggs, with John Larkin eventually taking over and portraying Perry Mason until the show's end.

The Perry Mason radio show initially aired on CBS Radio from October 18, 1943, to December 30, 1955. During its run, the series broadcasted a total of 3,000 episodes. Following the conclusion of the radio show, the series was adapted into the television show The Edge of Night, which ran for an additional 30 years. Notable sponsors of the Perry Mason radio show included General Foods and Tide, while several of the actors who portrayed Mason on radio, such as Bartlett Robinson and John Larkin, went on to appear in episodes of the Perry Mason television series starring Raymond Burr.

Sources: wikipedia.org, otrcat.com