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The Devil in the Dark
Series: The Original Series
Written by: Gene L. Coon
Directed by: Joseph Pevney
Novelization in: Star Trek 4 by James Blish
Production information
Episode no.: 1x26
Production no.: 6149-26
First aired: 9 March 1967
Date: 2267
Stardate: 3196.1



In the mines of Janus VI a group of miners arrive to relieve Sam of his guard duty. After he voices his concerns at the posting Schmitter is left on duty while the rest of the miners continue on to other parts of the mine. Moments later the miners hear a scream and run back to Schmitter, to find nothing but his charred remains.

Captain's Log, Stardate 3196.1: A distress call from the pergium production station on Janus VI has brought the Enterprise to that long established colony. Mr Spock, Doctor McCoy and I have beamed down to meet with chief engineer Vanderberg, administrative head of Janus VI.
The production station on Janus VI

The landing party from the USS Enterprise meet with Vanderberg who explains his predicament; Three months prior the miners opened a new level, rich in pergium and other minerals such as uranium, cerium and platinum. Typical conditions for the planet endowed with immense mineral riches. But something went wrong, the miners automatic equipment began to malfunction as parts of it were inexplicably corroded away. Maintenance engineers were sent to repair the equipment but were later found burned to a crisp. Something was in the mines of Janus VI sabotaging the machinery and killing the miners, at first in the lower levels, but over time moving up. The miners have stopped working, fearing their lives, if the Federation wants pergium then it’s down to the Enterprise to fix things so they can mine it.

Vanderberg and his chief processing engineer Ed Appel leave Kirk and Spock to examine maps of the mines. McCoy returns from examining the last victim’s body, reporting what’s left the man indicates he was corroded to death rather than suffering typical burning, almost as if he’d been thrown into a vat of acid.

Meanwhile elsewhere in the mine another guard is attacked. Vanderberg and the Enterprise team are called to the scene to find the reactor room damaged, and the reactor’s circulator pump stolen. The Enterprise has no replacements for such an antiquated device. The miners face two outcomes, death by asphyxiation if they turn the reactor off, or death by radiation poisoning if they leave the damaged device on.

Kirk has Scotty work on crafting a temporary replacement part while the team on the planet search for the missing pump. Kirk, Spock and McCoy discuss their options, Spock puts forth that maybe they dealing with life not as they know it, perhaps a silicon-based lifeform resides of Janus VI. Kirk has Giotto form a security team to hunt for the lifeform while he goes to inspect Scotty’s handiwork on the reactor.

Kirk and Spock at the mouth of a Horta tunnel

After adjusting his tricorder Spock picks up a silicon signature, but not before the creature attacks one of the Enterprise’s security team. Next to the charred remains they find a freshly formed tunnel, and then, come face to face with the creature. After a phaser shot the creature retreats into another tunnel.

Kirk regroups his security team and redeploys them to hunt with knowledge of the creature’s behaviour and abilities obtained in the brief contact. Scott informs Kirk his attempts at repair have failed, the Enterprise begins to beam the colonists up to preserve the limited air.

On the hunt, Kirk and Spock split to try and locate the creature. Then, trapped by a cave in the creature caused, Kirk meets it again. The two have a stand-off the creature weary of Kirk’s phaser, Kirk tries to talk to the being while waiting for Spock to arrive.

The Horta's message

When Spock does turn up the creature allows him to enter the area and then permits him to mind meld, at first all Spock can read is pain. The Horta attempts an alternative form of communication, etching into the rock “NO KILL I”. From his contact Spock could detect the creature is a highly intelligent being, called a Horta.

Kirk calls McCoy to the scene to try and treat the Horta’s painful phaser wound. While they wait Spock attempts another mind meld. McCoy arrives in time to hear Spock’s findings while he tries to treat the Horta. Still melding Spock and the Horta tell Kirk where the missing pump is, he goes to retrieve it.

Kirk returns with the pump and a broken Horta egg, unwittingly the miners had destroyed thousands of them with their machinery, spurring the mother Horta into retribution. The miners arrive to destroy the Horta and are stopped; Spock fills them in on their crimes. Then Kirk comes up with a way for the Horta and Humans to live peacefully together, the Horta tunnelling and miners processing to run an efficient mining operation together.



Ed Appel • GiottoHadleyHarrisonKellyJames T. KirkEd Leslie • Lewis • Leonard McCoy • Mother Horta • Roberts • Sam • Schmitter • Montgomery ScottSpock • Vanderberg • Vinci

Starships and vehicles

USS Enterprise (Constitution-class)


Janus VIVault of Tomorrow

Races and cultures


States and organizations

Federation StarfleetUnited Federation of Planets


Acid • sodium • Cerium • EggGoldPergium • Type 1 phaser • Type 2 phaserPlatinumPXK reactorSiliconSilicon-based lifeform • Thermal concrete • TricorderVulcan mind meldUranium • Zoology


Related stories

  • Horta - The Horta have appeared in numerous other stories, see the Horta article for a complete listing of appearances, some of the more notable appearances and those directly connected to this episode include:
    • Devil in the Sky (DS9 novel) - A group of Horta visit Deep Space 9. This novel explores the childhood and mothership of the Horta and establishes that the Human-Horta mining alliance lead to Janus VI becoming one of the most productive and profitable mining operations in the know galaxy.
    • A Rolling Stone Gathers No Nanoprobes (ST comic) - On Lythos Prime another Human-Horta mining operation fends off a Borg assimilation attempt.


published order
Previous episode:
This Side of Paradise
TOS episode produced Next episode:
Errand of Mercy
Previous episode:
This Side of Paradise
TOS episode aired Next episode:
Errand of Mercy
Previous story:
All Our Yesterdays
Star Trek 4
Next story:
Journey to Babel
chronological order
Previous Adventure:
Sonnet from the Vulcan: Omicron Ceti Three
Pocket Next Adventure:
Errand of Mercy
Previous Adventure:
This Side of Paradise
Voyages of the
USS Enterprise (NCC-1701)
(2264 to 2270)
Next Adventure:
Errand of Fury:
Seeds of Rage


External link

This article uses material from the "The Devil in the Dark" article on the Memory-beta wiki at Wikia and is licensed under the Creative Commons Attribution-Share Alike License.

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