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At the end of the film, an offscreen narrator recites the signature phrase of "The Shadow": "Who knows what evil lurks in the hearts of men? The Shadow knows." No contemporary reviews or exact release date have been located for the film, although NYSA records reveal that the picture was approved for exhibition in New York State in 1958. Invisible Avenger was re-released in Maryland in 1962 and in New York State in 1963 under the title Bourbon St. Shadows.
The 1962 version credited Willis Winford, as well as Joseph Wheeler, as Director of Photography, and Ben Parker was listed as the sole producer and director. It is not known if the difference in credits was due to the filming of additional sequences for the re-release, which modern sources indicate included some adult content scenes and had a running time of 60 minutes. The film was the last directed by James Wong Howe, who was most noted for his work as a cinematograoer from the 1920s through the 1970s. According to a modern source, Invisible Avenger was an unsold pilot film for a proposed television series based on "The Shadow." For more information about "The Shadow," please consult The Shadow Strikes in AFI Catalog of Feature Films, 1931-40.