Five Ounces of Treason - The Man Called X

An old acquaintance of Ken Thurston runs into an airplane propeller at La Guardia airport. He had pamphlets about how to create sabotage in his pockets. Thurston leaves for Cuba to find the source of the "infection."

The Man Called X is an espionage radio drama that aired on CBS and NBC from July 10, 1944, to May 20, 1952. The radio series was later adapted for television and was broadcast on the "small screen" for one season, 1956-1957.

Herbert Marshall had the lead role of agent Ken Thurston/"Mr. X" who took on dangerous cases in a variety of exotic locations. Leon Belasco played Mr. X's comedic sidekick, Pegon Zellschmidt, who always turned up in remote parts of the world because he had a "cousin" there. Pegon would annoy and help Mr. X. Wendell Niles was the announcer from 1947 to 1948. Gordon Jenkins Orchestra supplied the background music.

The series was created by Jay Richard Kennedy who later adapted The Man Called X to a 39-episode syndicated television series (1956–1957) starring Barry Sullivan as Thurston for Ziv Television.