The war lords of a potential enemy of the US has the spy ring, led by John Baroda, the Spy King and his aide Nitra, sabotaging the plans for a vast defense system of radar stations along the American borders. Radar Defense Bureau operative Chris Calvert comes to the rescue of a brilliant radar scientist, Joan Hughes, who has been kidnapped by Baroda henchmen in chapter 1 ("The Fatal Fog"), and the two battle together before putting an end to the Spy King in the aptly-named chapter 12, "Day of Reckoning".
| Tagline | ONE THRILL AFTER ANOTHER! |
| Release Date: | Nov 23, 1949 |
| Genres: | Action |
| Production Company: | Republic Pictures |
| Production Countries: | United States of America |
| Casts: | Kirk Alyn, Jean Dean, Anthony Warde, George J. Lewis, Eve Whitney, John Merton, John Crawford, Tristram Coffin |
| Status: | Released |
| Budget: | $0 |
| Revenue: | 0 |
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