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In the fourth episode of the six-part story "Dalek Invasion of Earth," the crew of the TARDIS tries to find out why the conquering Daleks have turned the British community of Bedfordshire into a huge mine. At last, the horrible truth is revealed: The Daleks intend to destroy the earth's magnetic core and convert the planet into their own personal space vehicle. Having injured his spine while filming the previous episode "Day of Reckoning," William Hartnell (the Doctor) is largely absent from this episode, with his stand-in, Edmond Warwick, replacing him in long and medium shots. Written by Terry Nation, "The End of Tomorrow" first aired on December 12, 1964.