A brawny coolie from the filthy waterfront of Hong Kong was Emperor of Asia and master of the vast reaches of Russia. Armed with mysterious new weapons which made the bravest man craven, he marched ruthlessly to conquer the world, and to win the proud daughter of the Muscovite nobility who scorned his amorous advances… Jimmy Christopher—Operator 5 of the United States Intelligence—had given America more than enough warning to prepare for the barbaric, invading yellow hosts. And when all seemed lost—when great cities were razed and countless thousands butchered—Operator 5 finally ignored restraining bureaucracy and pitted himself in a single-handed battle to wrest our nation from the Coolie Emperor’s bloody grasp!
Henry Steeger, the owner of pulp publisher Popular Publications, launched the monthly pulp magazine "Operator #5," about a hero who would "single-handedly, or almost, save the nation from complete destruction regularly every month," in 1934. The novels were published under the pseudonym Curtis Steele, and were written by Frederick C. Davis until November 1935, then by Emile C. Tepperman until March 1938, and then Wayne Rogers for the remainder of the run.