29 user 9 critic

The Devil in the Dark 

The Enterprise is sent to a mining colony that is being terrorized by a mysterious monster, only to find that the situation is not that simple.


Joseph Pevney


Gene L. Coon, Gene Roddenberry (created by)




Episode complete credited cast:
William Shatner ... Capt. Kirk
Leonard Nimoy ... Mr. Spock
DeForest Kelley ... Dr. McCoy
Ken Lynch ... Vanderberg
James Doohan ... Scott
Brad Weston Brad Weston ... Appel
Biff Elliot ... Schmitter
George Allen George Allen ... Engineer #1 (as George E. Allen)
Jon Cavett Jon Cavett ... Guard
Barry Russo ... Giotto


The Enterprise travels to the planet Janus 6 to assist the mining colony there. Kirk, Spock and McCoy beam down to the planet where Chief Engineer Vanderberg tells of a creature loose in the mine tunnels killing some of his men. The monster seems to appear out nowhere then disappears just as quickly. Finding that the creature, known as a Horta, lives in a newly opened part of the underground mining complex, Spock uses the Vulcan mind meld to determine why it is killing the miners. Written by garykmcd

Plot Summary | Plot Synopsis


TV-PG | See all certifications »

Did You Know?


Sulu and Uhura do not appear in this episode. See more »


Kirk addresses Giotto as "Lt. Commander" while he wears the sleeve braid of a full commander, equal in rank to Spock. See more »


Mr. Spock: Curious. What Chief Vanderberg said about the horta is exactly what the mother horta said to me. She found humanoid appearance revolting... but she thought she could get used to it.
Dr. McCoy: Oh, she did, did she? Now, tell me, did she happen to make any comment about those ears?
Mr. Spock: Not specifically, but I did get the distinct impression she found them the most attractive human characteristic of all. I didn't have the heart to tell her that only I have...
Captain James T. Kirk: [interrupts Spock] She really liked those ears?
Mr. Spock: Captain, ...
See more »

Alternate Versions

Special Enhanced version Digitally Remastered with new exterior shots and remade opening theme song See more »


Star Trek Theme
Written by Alexander Courage
See more »

User Reviews

Silicone Based Lifeforms
6 January 2017 | by Rainey-DawnSee all my reviews

Season 1, episode 25. The Enterprise is called to Janus 6, a mining colony there are being attacked and killed by a mysterious creature. Kirk, Spock and McCoy beam down to the planet's surface with a small away crew to investigate. Upon arrival they met with Chief Engineer Vanderberg who tells them what has been going on in more detail. The search begins for this creature that can kill a person with a strong corrosive substance. The crew learn that the miners have found seemly useless silicon nodules and the creature is a silicone based lifeform. Kirk and Spock search for the creature while McCoy beams back up to the ship. Kirk and Spock find the creature hurt and Spock conducts a Vulcan mind-meld with it to learn more about it - it is called a Horta. McCoy is called back down later to help this unusual patient while the miners are ready to destroy it.

An episode that is hard to forget. I used to describe the Horta as a bubbly burnt pizza-like creature but watching it again all these years later I would say it looks more like a meatball with sauce on it. That's OK though because the Horta thinks that humans are hideous looking but the Vulcan is pleasant looking to it. lol.


3 of 5 people found this review helpful.  Was this review helpful to you? | Report this
Review this title | See all 29 user reviews »

Frequently Asked Questions

This FAQ is empty. Add the first question.


Official Sites:

Official site




Greek | English | Latin

Release Date:

9 March 1967 (USA) See more »

Company Credits

Show more on IMDbPro »

Technical Specs


Sound Mix:

Mono | DTS (re-mastered version)| Dolby Digital (re-mastered version)


Color | Color (Technicolor)

Aspect Ratio:

See full technical specs »

Contribute to This Page

Recently Viewed