Victoria wasn’t just “an obscure actress.” She was Playboy’s Playmate of the Year in 1968, under the name Angela Dorian.
Note the dark brown eyes.
Colored contact lenses were around in the 1960’s. In fact, special contact lenses had already been used in Star Trek - the ‘silver’ eyes of Gary Mitchell and Dr. Dehner were made by sandwiching some kind of foil between two layers of contact lenses.
So if they really wanted to have the character have a different color of eyes, they had the means to do so.
Or, they could have just hired an actress with blue eyes. No shortage of those in Hollywood.
YOU TAKE THAT BACK!!! :mad:
OK, one more post until this gets resurrected again. . .
It’s always dicey to give credence to unsourced info, but that appears to be what happened here. A brief timeline (with respect to this board):
This question first appeared on this board on August 25, 2000, almost exactly 17 (Jiminy Cricket!) years ago. No resolution, but I had found a source that pointed to “The Star Trek Compendium” (1981) by Alan Asherman as the source of the Babcock story. If there are subtle differences between Vetri and Isis, there are a world of differences between Babcock and Isis (as well as Garr and Isis).
At this point, IMDB was showing only the credited cast members.
By 2006 (the date of this thread), Vetri was listed in the cast on IMDB. Apparently, from gleaning info from other sites, this appeared to have happened to some random postings (possibly long since lost to history) where some Playboy aficionado(s) noted the similarities between Vetri and Isis. It appeared on the Net somewhere, and it caught on. At some point an IMDB editor came across it, added it, and it then became ‘fact’.
The memory-alpha wiki was created in 2007, well after the IMDB entry, and whatever other online postings had preceded it. At this point, it’s going to be hard to extirpate it from the various places, but not impossible.
As noted above, and confirmed on other sites, production notes and call sheets have done nothing to resolve the mystery as the name of the actress just doesn’t appear. Unless Teri has something to share (as she is the only actor/actress to have actually appeared in a scene with her), this will be just an enduring mystery.
So far as Vetri’s denial of having been in the scene–that may or may not be relevant. It’s not unusual for bit part actors to just show up for work, and forget about whatever role they had just done. And Ms. Vetri has apparently gone thru a few brain cells over the years.
The world is still waiting. . . .
A point of clarification: When I say “principal players,” I mean both the actor **and **the character, i.e., “William Shatner–Capt. Kirk,” “Leonard Nimoy–Mr. Spock,” and so on. At this point, we can only speculate how Isis was listed in the call sheet: “1 shape-shifter cat”? :dubious: 
I checked the list of guest stars for this episode in the back of Whitfield’s book, BTW. Terri Garr is the only female member of the cast mentioned.
Here’s something I never knew before: If the spinoff series had gone into production, it would apparently have been called The Lincoln Logs, and Terri (or Teri, depending on the date) would have been the central character.
https://tse4.mm.bing.net/th?id=OIP.u5w6My6hZMSOY7g8N-hJEQEsDE&pid=Api
Has anybody thought to contact her and ask?
THIS is Isis in human form:
https://tse1.mm.bing.net/th?id=OIP.kpTRprPyxToyVg1m8Hfk4gEsDq&pid=Api
THIS is Victoria Vetri, aka “Angela Dorian”:
https://tse2.mm.bing.net/th?id=OIP.ckbWLn1srlNo-nIBH39P2gDhEs&pid=Api
If they’re one and the same woman, I’m a Morg:
https://tse4.mm.bing.net/th?id=OIP.D1BWov_zESW6_ARBHx-eUwEsDh&pid=Api
She won’t talk about her experience on Star Trek. Never has, says she never will. She gets kind of agitated when asked about it, so that channel of information would seem to be closed. 
nm
You know what, though? That could be Barbara Babcock in a wig and false eyelashes. She has a long nose like that, and wideset eyes.
Assuming, of course, this is not a mock-up meant as a canard. 
Possible, but it seems as though Isis has a little cleft in her chin. I don’t see one on Barbara.
https://tse1.mm.bing.net/th?id=OIP.IsIYnqOfag4fD-tzllwuNwD6Es&pid=Api
Interesting. Does anyone know why; does she not care for the overly-demanding fans, or was there something unpleasant about her time working on the show?
I believe there was some sexual harassment/molestation and such by some of the higher ups on the show. She doesn’t talk about it.
Read Solow and Justman’s book. That’ll give you an idea.
In an interview published in Starlog Magazine, Garr refused to talk about her appearance in Star Trek and made disparaging comments about Star Trek fans. She was glad that Assignment: Earth was never picked up as a series.
What’s wrong with swap meets? You can find some great merch! 
Bumping this thread for an update: After 50 years, the “Isis” actress has finally been positively identified.
Her name is April Tatro and she confirmed to The Trek Files that she did, indeed, play the cat Isis in her human form. In addition, the article has a screenshot of the casting sheet for that day, with Tatro listed as “1 cat girl.”
YES! I KNEW IT!!! I knew it, I knew it, I knew it!!! 
O frabjous day! Callooh! Callay! 