In contrast to the pulps, "The Shadow" radio drama limited the cast of major characters to The Shadow, Commissioner Weston, and Margo Lane, the last of whom was created for the radio series. Along with giving The Shadow a love interest, Margo was created because it was believed that including Harry Vincent as a regular would mean an overabundance of male characters (considering the criminals in the stories were usually male, too) and could possibly make it difficult for the audience to distinguish between the voices of so many male actors. The radio script for "The Death House Rescue" (reprinted in "The Shadow Scrapbook") features Harry Vincent, but he did not appear in the actual radio broadcast or any episode of the radio drama series. Clyde Burke made occasional appearances, but not as an agent of The Shadow. Lieutenant Cardona was a minor character in several episodes. Moe Shrevnitz (identified only as "Shrevvy") made several appearances as a simple-minded acquaintance of Cranston and Lane who sometimes acted as their chauffeur, unaware Cranston was actually The Shadow.