A mysterious alien creature has killed around 50 miners and destroyed equipment.

Captain Kirk, Spock, andDr.

Leonard Nimoy also mentioned the episode as one of his favorites in the 2016 documentary,50 Years of Star Trek.

Star Trek The Original Series TV Poster

Dr. McCoy gets an iconic scene, too, delivering one his most famous lines for the first time.

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Cast

Captain Kirk and Mr Spock in 1960s Star Trek

Custom by Ana Nieves

Custom Star Trek image of William Shatner as Captain Kirk, Leonard Nimoy as Spock, and DeForest Kelley as Dr. McCoy

Star Trek Devil in the Dark Kirk Spock

Star Trek Devil in the Dark Spock Kirk Horta

Star Trek TOS William Shatner as Kirk, Leonard Nimoy as Spock & DeForest Kelley as Dr. Leonard McCoy

Headshot Of William Shatner

Headshot of Leonard Nimoy

Star Trek: The Original Series