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In the third episode of the six-part story "The Reign of Terror," the Doctor (William Hartnell) arrives in the Paris of 1794, intending to save Barbara (Jacqueline Hill) and Susan (Carole Ann Ford). Meanwhile, Ian (William Russell) has managed to link up with a moderate underground revolutionary group, headed by a mercurial, and not altogether trustworthy, spy. As the Doctor prepares to impersonate the Superintendent of Parisian Prisons, Barbara and Susan are unexpectedly snatched from the jaws of doom by underground leader Jules Renan (Donald Morley). Written by Dennis Spooner, "A Change of Identity" first aired on August 22, 1964, and is one of four episodes of "The Reign of Terror" still known to exist.