I just watched the TOS episode By Any Other Name in which the Kelvan invaders (easily) modified the warp engines of the Enterprise in order to fly from this galaxy to the Andromeda galaxy (2.537 million light years) in under 300 years. In the episode it was noted how much more advanced this technology was.

At the end of the episode the Enterprise turns around and heads for home. But what happened to all that advanced technology? How come the Enterprise post this episode continued to fly around at "normal" warp speeds?

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    I just watched this last night, was about to ask the question when I saw the onebox in chat. +1 – user57650 Sep 4 '16 at 18:21
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    Off the top of my head, the most likely reason is simply that they don't want to rely on technology they have zero understanding of. – Ixrec Sep 4 '16 at 18:27
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    @Valorum except Spock mentioned how the Federation could use the Kelvan technology to send a robot ship to the Andromeda in order to invite the Kelvans to resettle in planets our galaxy. And that idea was seen in universe as being reasonable. And the whole basis of the episode was for the Kelvans to find new planets because of the on going catastrophe in the Andromeda galaxy. – Peter M Sep 5 '16 at 2:04
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    Perhaps that's where the Excelsior's transwarp drive came from? Of course, the quoted speeds are still several times faster than Voyager over a century later. But then, the list of magic technologies never heard from again is pretty extensive... – Stephen Collings Sep 5 '16 at 3:54
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Frankly, an out of universe answer may be most applicable here.

With few exceptions, in terms of actual in-universe consistency (barring Stardates of course) you can generally watch TOS episodes in any order. The thing to remember with TOS is that it wasn't intended to maintain an arc or generally even minute consistency from one episode to the next (except in broader beats). It has been said that TOS has no memory from episode to episode - unlike later series, TOS was meant to be an anthology show or little morality tales set with the same characters and settings. Additionally, apart from production staff like Robert Justman, Dorthy Fontana, Gene Coon, and Roddenberry polishing and modifying scripts, each episode had different writers that may not have been familiar with previous episodes. Scripts were often selected as to what to produce and air next, not on a story basis but in terms of time and cost and simply if the script was ready to go or not.

TL:DR - because Jerome Bixby (story for By Any Other Name) didn't write the next story (Return to Tomorrow - John T. Dugan) and nobody bothered to worry about what happened in the previous episodes generally from a broader, overarching storyline perspective

  • source: paraphrasing and analysis from reading Marc Cushman's "These Are the Voyages, Series 1 and Series 2 production background books)

You could interpret it as the Kelvans removing the technology once they are safe, following their own version of the prime directive. Sudden introduction of intergalactic travel would undoubtedly tilt the balance of power in the galaxy, and in the end could end up affecting the neighbors.

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    However in the episode Spock mentioned how the Federation could use the Kelvan technology to send a robot ship to the Andromeda in order to invite the Kelvans to resettle planets in our galaxy. And that idea was seen in universe as being reasonable. – Peter M Sep 5 '16 at 2:03
  • What happens when Romulans or Klingons steal it from a Federation ship and head to Andromeda with an army instead? – Drunken Code Monkey Aug 24 '17 at 2:26
  • With no supply lines, they get their heads handed to them by galaxy-spanning civilizations hundreds or more years advanced than them. – Philip Kelley Jul 17 '20 at 18:48

My guess would be the Roman's laptop. Sure, he knows what it is and what it does, and can even be instructed in its use, but he will never be able to even grasp the fundamental concepts behind its construction.

Similarly, the Federation has this technology, and knows what it does, but its technology is simply far too advanced to replicate. The Federation, though, being what it is, might have been able to confirm one or two of their already existing hypotheses, which advanced them enough to develop the transwarp drive.

  • It sounds like the development of the trans warp drive would be a good answer here. Do you have any evidence to back it up though that you could edit in? – TheLethalCarrot Aug 21 '20 at 5:11

The technology would have been removed from the Enterprise for reverse engineering by Starfleet, and eventual inclusion in future starships. Hence the Excelsior had "Transwarp" drive in Star Trek III: The Search for Spock. But some of the more easily analyzed technology might have remained aboard the Enterprise (especially if it would have been difficult to uninstall it). Hence the Enterprise would be reinforced to withstand high warp speeds, up to over Warp 14 ("That Which Survives").

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    Hi, welcome to SF&F. This is a pretty good theory, but it would be a good answer if you could find some quotes or references to back it up. – DavidW Jul 17 '20 at 17:34
  • The fact that the Enterprise D could go up to Warp 10, which was supposed to be quite an achievement, the fact that the Enterprise was going in circles at Warp 10 in "This Shall Be Your Last Battlefield" after they wrested control back from Bele, the vact, that, as I mentioned the Enterprise could handle up to Warp 14.1 without being destroyed, and the fact that the Excelsior had "Transwarp" drive. As for direct references to the Kelvans, in TOS it was hard to find a reference to any previous episode in a later one. – James Levee Jul 18 '20 at 18:20

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