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In the fifth episode of the six-part story "The Enemy of the World," traitorous scientist Kent (Bill Kerr) has blown up the research station infiltrated by the Doctor (Patrick Troughton). Not long afterward, 21st century dictator Salamander, who bears a startling resemblance to the Doctor, makes an appearance. But is Salamander really the Doctor -- or is it the other way around? Also in the cast is Mary Peach as dauntless copter pilot Astrid. Written by David Whitaker, "The Enemy of the World, Episode 5" first aired on January 20, 1968; this episode is presently unavailable.