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"The Enemy Within" was an alternate title for two different Doctor Who stories. One of the working titles for "The Invisisble Enemy" was "The Enemy Within," and it was referred as such on the Doctor Who sound effects LP released by the BBC in 1977. "The Enemy Within" was also proposed as a title by producer Philip Segal for the 1996 television movie at a Doctor Who fan convention. Given the glib nature in which the title was thrown out, most fans do not use it and simply refer to that adventure as "The TV Movie."