An industrial spy is found murdered in an out-of-the-way pottery factory. Posing as an author, Cathy investigates the killing, which is tied in with a secret formula for an unbreakable ceramic. Alas, Cathy herself is most breakable, and she has quite a time remaining in one piece before Steed arrives on the scene. First telecast in England on January 12, 1963 (and not seen in America until February 15, 1991), "Immortal Clay" was written by James Mitchell. ~ Hal Erickson, Rovi