A series of elaborate practical jokes result in humilation for a number of top British and Iron Curtain officials. When one of the jokes turns deadly, Steed and Emma are called upon to investigate. It turns out that the cause of all the trouble is an exclusive organization known as the Hellfire Club, obliging Steed to join up while Emma provides support from the sidelines. Written by Brian Clemens, "A Touch of Brimstone" was originally telecast in England on February 9, 1966. The episode was never shown on American network television, due in great part to the very provocative outfits worn by Emma Peel when she poses as "The Queen of Sin." ~ Hal Erickson, All Movie Guide