The narrator, actor Frank Readick Jr., introduced the program with a sinister voice, "The Shadow knows all" and thus, The Shadow was born and became an immediate hit with the listening audience. Though, the program was canceled after 52 episodes, the character continued on with his own magazine.
Other attempts of a Shadow program were aired with Readick narrating "Blue Coal Mystery Revue" and later a NBC radio series proclaiming "Crime Does Not Pay," followed by a chilling laugh, however, they too were dropped from the airwaves.
On September 26, 1937, Street & Smith gave The Shadow a central role, and a long-time radio residence, on the Mutual Broadcasting System network. The first show, starring Orson Welles, was titled "Death House Rescue." The last radio program had Bret Morrison portraying the mysterious sleuth. It was titled "Murder by the Sea," and aired on December 26, 1954.
Below is "The Shadow" radio show disambiguation page. It serves to clarify the difference between several of the radio programs in which The Shadow narrated and starred in as a central character.