This the first of two different feature versions of the 1935 serial "The Lost City" which producer Krellberg had cut and released simultaneously with the serial, in this instance the first four chapters with some new but vague ending footage which could allow the remaining episodes to be shown in following weeks.)
Producer Krellberg decided to make yet again a new feature version of his serial, already twice featurized, using more of the full serial and giving it a new title.
Krellberg added more footage from this serial to the feature version in order to expand its running time, especially for TV sales which were anticipated to follow a brief theatrical and 16mm film release.