The Enemy Within
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Director
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Leo Penn
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Writer
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Richard Matheson
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Series
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Star Trek: The Original Series
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Season
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1
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No. in season
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5
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No. in series
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5
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Original airday
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Thursday
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Original airdate
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6th October 1966
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Previous episode
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Next episode
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The Enemy Within is the fifth episode of the first season of Star Trek: The Original Series.