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The Star Trek: Voyager episode "Threshold" is a popular target of ridicule. Its treatment of the warp scale appears to be inconsistent with the rest of the franchise, and its treatment of evolution is also inconsistent with science and common sense.

                               What? JANEWAY is evolving!                 JANEWAY evolved into... ???!

I've seen many quotes from cast and crew expressing regret about that episode. However, I've also seen a more extreme claim frequently repeated online: that the episode was considered so bad, and so nonsensical, that the writers later struck it from canon altogether -- the only time that this has ever happened to a Star Trek episode.

Is there any evidence to support this claim? This could include comments from the crew, or evidence from later episodes. Also, if true, is this the only Star Trek episode that has been treated like this, or does anybody know of other episodes also be retconned out of existence?

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Its treatment of the warp scale appears to be inconsistent with the rest of the franchise - It's not, actually. TNG-onwards a different scale was used where Warp 10 is a theoretical infinite speed. TOS, ENT, and flash-forwards into alternate timelines are places that don't use that scale. – Izkata Jul 12 '14 at 3:44
"its treatment of evolution is also inconsistent with science and common sense" -- no more so than the TNG episodes "Genesis" (details at ), which posits that activating some dormant genes can rapidly transform the body of an adult, and that one of Barclay's ancestors was a spider, or "The Chase" (see ) which posits that the evolution of humanoids is not really driven by natural selection (and that all other genetic lineages somehow "know" that they don't need to evolve into humanoids too) – Hypnosifl Jul 12 '14 at 3:58
I always thought it was an attempt by Tom Paris to come up with an original holodeck program rather than rehashing old ones and it turned out like bad fan fiction. I wished they threw in a line by harry about it. Harry: "Remember when you tried to write that story about warp 10?" Tom: "I don't want to talk about it." Harry: "Yeah... that one got a little weird... Janeway?" Tom: "I said I don't want to talk about it." – John Meacham Jul 12 '14 at 4:10
@Izkata - maybe, but you could also interpret that episode to mean that whatever mysterious force had "chosen" the hadrosaurs to become humanoid out of all the lineages on Earth, it had to make a new choice when they left the Earth and all the dinosaurs went extinct. I don't see any good way to explain the vast number of lineages on Earth that don't seem to be evolving in any kind of humanoid direction--from starfish to arthropods to plants--despite the fact that they all evolved from the same "seed" cells planted by the ancients, unless there is some sort of coordinating force. – Hypnosifl Jul 12 '14 at 4:52
Hell, I consider anything which embarrasses believes in the whole idea of "cannon" to be cannon. As always the question to the question is "Considered by whom?" and the only available answer is "By those who insist that they do the considering." Meh! – dmckee Jul 13 '14 at 5:46

It seems from the discussion here that the reason for the "removed from canon" rumor was a comment by Tom Paris in the later episode "Day of Honor" that he'd never made a transwarp voyage. However, his actual comment (from the transcript here) was "I've never navigated a transwarp conduit."

A transwarp conduit was a specific type of channel through a realm of subspace known as "transwarp space", used commonly by the Borg. In various examples of Starfleet experimenting with transwarp there is no evidence that a preexisting conduit had to be used, so it may simply have been a matter of the Borg using a different type of transwarp technology than Tom Paris used in "Threshold", and if so his later comment in "Day of Honor" wouldn't contradict his transwarp voyage in "Threshold".

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Good point, thanks. – Jeremy Banks Jul 12 '14 at 5:04

Threshold has never been formally removed from the Star Trek canon, although it seems quite likely that those involved in the production (behind the camera) would prefer if it simply went away;

As mentioned in @hynosifl's answer, the quote from "Day of Honor" that people often point at (e.g. to suggest that the episode has been retconned out of existence) actually refers to a different technology;

PARIS: I've never navigated a transwarp conduit. Any problems I should be aware of?

That said, even the writers accept that there were many technical failings with the episode, especially in regard to how Transwarp works in the episode and the "de-evolution" of Janeway and Paris.

TNG's Producer Brannon Braga describes it thusly;

"It's a terrible episode. People are very unforgiving about that episode. I've written well over a hundred episodes of Star Trek, yet it seems to be the only episode anyone brings up, you know? 'Brannon Braga, who wrote 'Threshold'!' Out of a hundred and some episodes, you're gonna have some stinkers! Unfortunately, that was a royal, steaming stinker."

and TNG's 'Senior Technical Consultant' Rick Sternbach basically tried to handwave the whole episode away;

""I think what may have happened with the silly Warp 10 episode was that there was a coupling of the energy from the shuttle to all of the energy and matter of the universe (which might be possible if we're looking at a finite system), and the shuttle was able to access any point anywhere by some amazing tunnelling phenomenon which shrank the normal 3D distances to points, much like all the universe being squished into a pinpoint at the big bang because it was all energy with no need for elbow room. Whew."

Note that that neither of them explicitly state that it was a dream/not a real episode/non-canon.

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I'm surprised Brannon Braga claims this "seems to be the only episode anyone brings up". To me his name is pretty much a guarantee of terrible writing, starting with "The eye of the beholder", towards pretty much anything he touched. – o0'. Jul 12 '14 at 18:03
@Lohoris - Given that he wrote over 100 episodes across four series, it's a bit harsh to say that all of his episodes were poor; what about 'Timescape' or 'All Good Things' or 'The 37's' or 'Scorpion I, II'? – Richard Jul 12 '14 at 18:10
IMHO: "The 37's": terrible. "Timescape": AWFUL. (Trek has never done time travel well and undoubtedly never will.) "All Good Things": barely acceptable, despite the time travel. "Scorpion I, II": It's got precognition, a weak form of time travel. That weakens the episode. It's all right -- for Voyager. Of course you didn't ask my opinion anyhow. – Ross Presser Mar 18 at 5:22
@RossPresser: "City on the Edge of Forever"? Generally regarded as one of the top 5 (if not the top) episode of all of Trek... – HeartWare Mar 18 at 8:12
Time travel again. I'll give it points for being actually written by Harlan Ellison, though. Braga may claim the screenplay but it certainly wasn't his idea. – Ross Presser Mar 18 at 17:22

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