sentences:  Although ostensibly in the crime genre, the "Secret Agent X" stories were situated at the more far-fetched end of the spectrum, with a number of science fiction elements such as futuristic weapons and mad scientists.They were generally given highly sensational titles such as "The Ambassador of Doom" (May 1934), "Servants of the Skull" (November 1934), "The Golden Ghoul" (July 1935), "Satan’s Syndicate" (August 1937) and "Curse of the Crimson Horde" (September 1938).There were a number of similarities between Secret Agent X and other pulp heroes of the time such as The Shadow, the Green Lama and Operator No.