In the final episode of the six-part story "The Reign of Terror" -- which, incidentally, was also the final episode of Doctor Who's first season -- the crew of the TARDIS is still trapped in France at the time of the Revolution. Admidst much treachery, the Doctor (William Hartnell) makes a new friend who may be able to expedite the rescue of Barbara (Jacqueline Hill), Susan (Carole Ann Ford), and Ian (William Russell) from the guillotine. As it happens, however, the fate of all concerned may rest with an obscure Corsican corporal named Napoleon Bonaparte (Tony Wall). Written by Dennis Spooner, Doctor Who: Prisoners of the Conciergerie first aired on September 12, 1964, and is one of four episodes of "The Reign of Terror" still known to exist. ~ Hal Erickson, Rovi