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The Changeling 

A powerful artificially intelligent Earth probe, with a murderously twisted imperative, comes aboard the Enterprise and mistakes Capt. Kirk for its creator.


Marc Daniels


Gene Roddenberry (created by), John Meredyth Lucas




Episode complete credited cast:
William Shatner ... Capt. Kirk
Leonard Nimoy ... Mr. Spock
DeForest Kelley ... Dr. McCoy
James Doohan ... Scott
Nichelle Nichols ... Uhura
George Takei ... Sulu
Majel Barrett ... Christine Chapel
Makee K. Blaisdell ... Singh (as Blaisdel Makee)
Barbara Gates Barbara Gates ... Crewwoman
Meade Martin Meade Martin ... Crewman
Arnold Lessing Arnold Lessing ... Security Guard
Vic Perrin Vic Perrin ... Nomad (voice)


The Enterprise encounters a powerful energy force that has apparently killed all human life in a solar system with over one billion inhabitants. They identify the culprit as a small space probe that had its origins on Earth. Called Nomad, it merged with another and, as a result, took on a new mission to destroy all biological beings as being imperfect. It believes Captain Kirk to be its creator and, as such, has spared the Enterprise and its crew, at least temporarily. Written by garykmcd

Plot Summary | Plot Synopsis


TV-PG | See all certifications »


Official Sites:

Official site




English | Swahili

Release Date:

29 September 1967 (USA) See more »

Company Credits

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Technical Specs


Sound Mix:




Aspect Ratio:

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Did You Know?


William Blackburn appears in three different uniform colors in this episode: his usual gold (as Hadley), a blue uniform in a corridor scene, and in a red technician's jumpsuit in main engineering. See more »


In the final scene on the bridge there is a blonde communications officer sitting at her station in the wider shot. As the scene cuts back and forth between close-ups of Captain Kirk and the wider shots, there is nobody sitting at the communications station in the close-ups, yet there is in the wider shots. See more »


Capt. Kirk: [of Nomad's demise] It's not easy to lose a bright and promising son.
Spock: Sir?
Capt. Kirk: Well, it thought I was its mother, didn't it? D'you think I am completely without feelings, Mr. Spock? You saw what it did to Scotty. What a doctor it would have made.
[a beat]
Capt. Kirk: My son, the doctor.
Capt. Kirk: [fists his own heart] Kind of gets you right there, doesn't it?
See more »

Alternate Versions

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


Featured in For the Love of Spock (2016) See more »

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User Reviews

Inspired first ST movie
24 June 2006 | by maverick-154See all my reviews

This episode obviously inspired the plot of the first Star Trek Movie where the mysterious and immensely powerful and dangerously destructive evil force is referred to as "V-ger" by the kidnapped and subsequently returned (and reprogrammed) female crewperson of the new and improved Enterprise.

In the movie eventually Kirk and Spock figure out that "V-Ger" is really the old Voyager spacecraft sent out as a probe in the twentieth century (they clean some charcoal off the 2nd through 4th letters of the machine's still existent painted on name) and long lost track of. Well, clearly it must have been damaged in flight at some point and then met up with some other probe of some other kind from some other planet with some other prime directive. The two machines "helped" each other repair themselves and combined forces to become much stronger but corrupting their prime directives as the two combined forces.

But gee, how could they figure all that out about V-Ger? Well, maybe it's because they went through most of all that before with the TV episode involving Nomad: the 1 meter long, square columnar, self-levitating and mobilizing metal box around which this episode revolved. Nomad had basically the same background story and was just as terse and ruthless in carrying out it's corrupted prime directive (and with just as much unlimited power - albeit on a much more limited production budget) to "Sterilize! Sterilize!" as V-Ger.

I mean...Spock had already solved the Nomad mystery via a Vulcan mind meld with Nomad (via "Creator Kirk" 's permission) so figuring out V-Ger's problem must have been a piece of cake! My favorite Nomad quote is simply "Non Sequiter!" when presented with some feeble attempt at logic by an obviously inferior human. As soon as I first heard it I immediately added it to my vocabulary...and have used it quite frequently ever since.

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