In Post-war America fear took on new forms. The witch-hunt of superpower espionage swept the West. If you weren't a patriot you were suspect.We needed heroes. We needed Mr X.Herbert Marshall played the role of agent Ken Thurston - the 'Mr. X' who travelled far and wide across the globe as he unravelled dangerous cases. In this he was ably assisted, or perhaps annoyed, by a comedic side-kick; Pegon Zellschmidt.The Nation and ourselves were in safe hands even if he wasn't.