An apparent security leak takes on bizarre dimensions when the suspected traitors begin behaving like little children. It turns out that each of the persons involved apparently had the same nanny in childhood. With this clue in hand, Steed and Emma infiltrate a nanny training school, where they discover that the faculty is moonlighting in espionage. Written by Philip Levene, "Something Nasty in the Nursery" was first seen in England on April 22, 1967, and in America on May 5 of that year. ~ Hal Erickson, Rovi