1.25 The Devil in the Dark

Investigating reports of a mysterious creature threatening the mines of Janus VI, Kirk and Spock are brought face to face with the silicon-based Horta. Initiating a mind-meld with the being, Spock soon discovers the startling reason for the Horta's actions...

The Devil in the Dark
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TOS Season 1, Episode 25

Gene L. Coon
Joseph Pevney

First Aired Mar 9, 1967
Stardate 3196.1