The one with all the nurses in the Psycho house with a strangler on the loose. This one gave kids nightmares for years.
Season 3 episode 17, based on a story by Ethel Lina White and written for TV by James Bridges. Director: Joseph M. Newman. Host: Alfred Hitchcock. The cast: Dana Wynter, T.C. Jones, Louise Latham, John Kerr, E.J. André, Stephen Roberts, Cathie Merchant, John Willis, Lew Brown & Len Hendry. Original air date: 15 February 1965.