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This exotically titled Avengers episode is a working of the 1962 "Cathy Gale" installment "The Big Thinker." The title character is a highly advanced computer that is "murdered" by a shotgun blast. The perpetrator of this outrage would seem to be the creator of the computer, but Steed thinks otherwise; as a result, Tara poses as the creator's American niece, in hopes of rooting out the actual culprit. Written by Tony Williamson, "Whoever Shot Poor George Oblique Stroke XR40?" made its TV debut in America on October 30, 1968, followed by its British TV bow on December 9 of that same year.