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".

• Republic Pictures
• Kirk Alyn
• Jean Dean
• Anthony Warde
• George J. Lewis
• Eve Whitney
• John Merton
• John Crawford
• Tris Coffin