The “Ray Generator” (“Trident Scanner”) Prop

Star Trek Phase II Ray-Generator Reproduction

So, we’ve talked in the past about how props in Star Trek get re-purposed.  That is, they outlive their usefulness and are given a new paint job or they have buttons added or are modified in one way or another so that they can rise again!  This prop is one of these “re-purposed” props.

Some of the components of the “ray generator” prop first appeared on the business end of the sonic disruptor pistol hand weapons used on the planet Eminiar VII in the first season episode “Taste of Armageddon” (episode 23).  These weapons have a curved pistol grip, a main body, and a “barrel;” the barrel consists of five small pieces of aluminum with some clear red plastic sandwiched between them.

Eminiar VII Sonic Disruptor Pistols

After it was decided the crew of the Enterprise would no longer return to Eminiar VII any time soon and the Star Trek production team would no longer need the several Eminiar sonic disruptor pistol hand props, the question gets asked: “What can be done with the Eminiar props?”

Of course, the aluminum and red plastic sandwich barrel units ultimately got removed from the Eminiar sonic disruptor pistol weapons.  Many of them became simple devices in their own right; Dr. McCoy used them on the planet Omega IV–possibly to conduct some kind of medical research.  If you look carefully, you can see a couple of them sitting on the workbench tabletop along with a couple of scalpel devices and a couple of “jumper” blocks and a green tape deck cartridge in the second season episode “The Omega Glory:”

"The Omega Glory"

We see Sargon and Thalassa using one in a similar fashion in the second season episode “Return to Tomorrow.” It is possibly some kind of engineering or research or medical device used to help construct android bodies; we see it sitting on the workbench tabletop:

"Return to Tomorrow"

But not all of the “aluminum and red plastic sandwich barrel units” simply became loose little instruments and tools.  Some of them were stuck onto the end of a newly-constructed prop: a “ray-generator.”

The term “ray-generator” first appears in the script for the episode “Metamorphosis” (episode 31) (which is where this prop makes its first appearance).  “Metamorphosis” was the second episode filmed for Star Trek‘s second season.  The script, written by Gene Coon, has this to say In Act II, Scene 39:


He has a ray-generator of some sort in hand, is examin-
ing the circuits thoughtfully. He takes his generator,
aims it, turns it on. There is a high pitched HUMMING
SOUND, and Spock looks pleased. Obviously whatever
he has done has worked.


As The Companion materializes behind him, silent at
first… we should get the impression that it is look-
ing over his shoulder. Then its lights begin to change
… from gentle pastels to more angry bold colors–
and we begin to HEAR it… but it is not the melodic,
gentle tintinnabulation of bells… it is a harsher,
more acute sound… as though it is angry. Spock
hears it, turns around and reacts.

He strikes out… but hits nothing. The generator in
his hand shoots out smoke and flame… short circuits
hit the exposed control panel in the rear of the shuttle-
craft… and then as Spock shouts there is a CRACKLING as
of electricity, and Spock’s body is hurled backward
against the bulkhead, and he slumps to the ground, un-
conscious. The Companion hovers, and the HUM changes
to one of more moderate, peaceful intensity.

And here’s a shot from that scene:


As you can see, this is a large bodied, bulky prop with three of those “aluminum and red plastic sandwich barrel units” stuck to the top.  It has a screen of sorts on it and some bulky silver knobs and a large knob towards the bottom.  It is grayish in color.

So, the earliest reference to this device is as a “ray-generator.”  Later, Stephen Whitfield took pictures of this prop for his book The Making of Star Trek.  In that book he called the device a “(Spock Built) Ray Generator and Energy Neutralizer.”  (Although there is no reference to Spock having cobbled this device together out of available components while the Galileo was stranded, perhaps Whitfield thought Spock did exactly that.)  At any rate, here is Whitfield’s photograph:

The Making of Star Trek

The next time we see the ray-generator prop, Mr. Scott uses it on board the Constellation in the second season episode “The Doomsday Machine” (episode 35).  (Interestingly, Scotty knows exactly where to find this device–hidden in a “secret compartment” in Engineering.  (So starship operations would seem to be remarkably standardized–all the way down to where they keep their tools: Scotty knew exactly where the Constellation‘s chief engineer kept the ray-generator!)

Here’s Mr. Scott retrieving the ray-generator:

"The Doomsday Machine"

And here he is a short time later seen using the ray-generator device to help in his task of cross-connecting the impulse engines so they can be controlled with the warp engine control panel.  (The man’s a freakin’ genius!)

"The Doomsday Machine"

We see the ray-generator again in the second season episode “The Ultimate Computer” (episode 53).  (This and the “Metamorphosis” shot are probably the best look we get at this device in The Original Series.)  Ensign Harper (God rest his soul) uses a ray-generator to help get the M-5 computer hooked up.

"The Ultimate Computer"

And then he grabs it again when he goes to pull the plug on M-5:

"The Ultimate Computer"

There are three more appearances of the prop–but two appearances are relatively recent appearances and might be considered prop “reproductions.”

In the movie Star Trek V: The Final Frontier, we see a bridge officer on the Enterprise NCC-1701-A using a ray-generator.  You can see that it’s a slightly different style (which makes sense, I suppose, given all the years of elapsed time).  There are reddish-colored buttons on the front of the device below the “screen,” rather than two silver rectangular blocky-knobs.

Star Trek V: The Final Frontier

Star Trek V: The Final Frontier

In the Deep Space Nine episode “Trials and Tribble-ations” (episode 504), the crew of Deep Space Nine travels back in time to the events of the original Star Trek episode “The Trouble with Tribbles” (episode 42) where, using special effects, they are digitally added in to old original footage.  In some newly-added scenes, an Enterprise Lieutenant works on some power conduits using the ray-generator with Chief O’Brien and Doctor Bashir.  Apparently, the writer of the “Trials and Tribble-ations” script did not know this prop already had a name from the “Metamorphosis” script; in the “Trials and Tribble-ations” script, the device is referred to as a “Trident Scanner.”  With its three prongs or “three (tri-) teeth (-dent)” on the front end, it does indeed look rather like Poseidon’s trident.  However, I prefer the original term “ray-generator” from the “Metamorphosis” script.

Here’s a shot from “Trials and Tribble-ations:”

"Trials and Tribble-ations"

As Star Trek prop fans go about their hobby of reproducing various Star Trek props, there’s been one silly little nagging question with this ray-generator prop: on the sides of the prop up near the top–are there two round button/bolt things–or not?  When you blow up the shot from “Metamorphosis,” it looks like there are a couple of round button/bolt things–and the main body looks to be about an inch and a half thick.


But when you look at it in “The Doomsday Machine,” it doesn’t look like there are those round button/bolt things–and the main body looks more like two inches thick.


So, is it one and a half inches thick with bolts or is it two inches thick without bolts?   Of course, Star Trek prop fans love arguing about such prop minutiae.  It turns out, there is a little-known answer to that question–and it lies in a few brief frames in the background of the episode “I, Mudd” (episode 41):

"I, Mudd"

What we see by blowing up those frames from that episode (although it is a bit hard to see) is that there were actually at least two ray-generator props constructed.  This makes sense: one of them had to actually burst into flames in Leonard Nimoy’s hands in the episode “Metamorphosis.”  It’s not surprising that more than one would have been made.


Although we can’t actually see whether one has bolts and one doesn’t, it does appear that one is a bit thicker than the other. And simply knowing that at least two of these props were made certainly accounts for any discrepancies between different versions seen on screen. So the answer probably is: there are both kinds!

Our prop reproduction at the Star Trek New Voyages / Phase II studio is the thinner, two-bolt variant:.  Here are some shots of our “ray-generator” prop reproduction:

Star Trek Phase II Ray-Generator Reproduction

Star Trek Phase II Ray-Generator Reproduction

Star Trek Phase II Ray-Generator Reproduction

Star Trek Phase II Ray-Generator Reproduction

Star Trek Phase II Ray-Generator Reproduction

Star Trek Phase II Ray-Generator Reproduction

As always, questions, comments, feedback, and, of course, “shares,” “likes,” or “+1s” are always appreciated.

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Author Greg Schnitzer

Gregory L. Schnitzer is Co-Executive Producer on the fan-based Internet series Star Trek New Voyages/Phase II (formerly known as Star Trek New Voyages). Greg is a Registered Nurse and is often in charge of Emergency Medical Services at the Star Trek New Voyages/Phase II shoots. He is also the production's Property Master and on-again, off-again Set Decorator. Born and raised in Los Angeles (which he still calls "home"), in real life, Greg is a Registered Nurse, currently working in Health Information Management at a variety of medical facilities in the greater metropolitan Washington, D.C., area. Find Greg's page on the IMDB at:

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Join the discussion 2 Comments

  • Hi Gregory–I just wanted to tell you that I find all your posts regarding TOS props and their recreation for ST:P2 fascinating. I never considered that aspect of the production, though it’s a total no-brainer. What I love best is that you can discover or apply uses to what were obviously generic futuristic doohickies to the set dressers at the time. As a radio enthusiast, I discovered a similar hobby with finding, identifying and dating old radios in the show Quantum Leap to see if they were anachronistic or not. To see you doing something similar with Trek gives me an odd thrill, which is magnified by your actually recreating the props. I will never look at New Voyages the same way again. Thank you for enhancing an already enjoyable viewing experience!

  • Leland Frame says:

    Ever wonder why the Eminiar disruptors look so much like Klingon disruptors? It’s because they are! I’m talking continuity here. I think that the Klingons made contact with Eminiar VII and engaged in a little arms trade, selling them outdated hand weapons in exchange for some other technology. They probably had little other contact, seeing as how the Eminian method of warmaking would be dishonorable to them. They probably wouldn’t even try to conquer the planet, because it wouldn’t be much of a fight and there’s no fun in that for a Klingon.

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