The Devil in the Dark

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"The Devil in the Dark" is the twenty-fifth episode of the first season of the American science fiction television series Star Trek. Written by Gene L. Coon and directed by Joseph Pevney, the episode first aired on March 9, 1967. In the episode, the Enterprise is called to investigate deaths at a planetary mining facility. Spock and Kirk go on a mission to the facility, leading to them facing off against a deadly subterranean creature. This episode marks the first appearance of Doctor McCoy's catchphrase, "I'm a doctor, not a ..."

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