Ripped from the pages of the October, 1934 issue of "Operator #5" magazine, here is the lead novel -- Invasion of the Dark Legions! A ghost ship sailed silently through the moon-lit night, manned by a crew of dead men. Jimmy Christopher stands frozen with terror at the sight before his eyes - an evidence of bacteriological warfare, of a foreign dictator's first death-blow at the heart of a nation. It foreshadows the epidemics of ravishing, man-made plagues which are to come - the midnight of a powerful, secret army, already assembled within the land their power-maddened master covets. What vicious undercover emissary plots this wholesale murder? How can Operator 5 hope to save the country he loves from the slave-yoke of a greedy, foreign demagogue?
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.