The film was a compilation of two television pilot episodes of a 1957 Republic Pictures[1] TV show called The Shadow.

When the show failed to sell, the episodes (one of which was directed by cinematographer James Wong Howe) were edited together and released as a theatrical feature called Invisible Avenger.

[4] Pablo Ramirez is an expatriate from the Caribbean nation of Santa Cruz that is under control of a military dictator called the Generalissimo.

To assist in this and to protect him from the Santa Cruz secret police who are in New Orleans he seeks the help of Lamont Cranston through a mutual friend, jazz trumpeter Tony Alcade.

Cranston and his metaphysical mentor Jogendra come to New Orleans to bring Tony's murderers to justice and freedom to Santa Cruz.