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The working title of this film was Pier 23, which was the release title of the next film in the "Dennis O'Brien" series. Voice-over narration is provided by Hugh Beaumont, as his character "Denny O'Brien," throughout the film, which was shot on location in San Francisco, CA. The June 14, 1951 Daily Variety review states that the film was created as two thirty-minute segments that were to be screened on television following the film's release in theaters, but a record of this telecast has not been found.
Roaring City was the second of three "Dennis O'Brien" films featuring Beaumont as the amateur detective. Like the other two films in the series, Roaring City consisted of two separate stories that could be broadcast as television episodes after the theatrical release. For more information on the series, consult the Series Index and see the entry above for Danger Zone.