It became an unofficial sequel, Secret Service in Darkest Africa, with Cameron's character renamed Rex Bennett, and the feminine lead Joan Marsh becoming a British character, as in G-Men vs. the Black Dragon.
It was the most expensive Republic serial of 1939 and the second most expensive of all Republic serials after Captain America (1944, $222,906), just beating Secret Service in Darkest Africa (1943, $210,033).
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