Gunpowder Plot
On 5 November 1945, Basil Rathbone and Nigel Bruce starred as Sherlock Holmes and Dr. Watson in an episode of "The New Adventures of Sherlock Holmes" entitled "The Gunpowder Plot", in which their client James Stuart (who claims to be a descendant of King James I) is terrified that his cousin Guy Fawkenby is planning to kill him on Guy Fawkes Day by recreating the Gunpowder Plot of 1605. Their investigation does turn up many parallels to the original Gunpowder Plot, but takes a sudden and unexpected twist at the end. This episode is available for download on many sites.