Geordi was transformed into an invisible creature in the episode, "Identity Crisis".

The Geordi-creature could see and had glowing eyes.

How could the Geordi-creature see when Geordi's eyes did not work?

Is there an answer in the novelization? Or in the script?

  • 4
    He was undergoing some weird regenesis - perhaps it temporarily fixed his eyes?
    – HorusKol
    Feb 16, 2017 at 13:01
  • 1
    +1 to @HorusKol - he's literally becoming a different creature
    – NKCampbell
    Feb 16, 2017 at 16:20
  • 1
    He's literally becoming a different species and can barely recognize his friends, but you question why he could see?! I hate the soft scifi trope of biological compatibility between lifeforms from different worlds, and medicine that transcends species, etc. But that is some seriously selective suspension of disbelief. If it can do that, it can also fix his eyes (or develop new ones). Feb 16, 2017 at 16:24
  • This is not going to get any kind of useful answer except that alien biology that does impossible things can do biologically impossible things. Feb 16, 2017 at 16:26

1 Answer 1


The alien parasite rewrites people's DNA, and also (unstated in the episode because the writers thought DNA was magic) forced some sort of redevelopment of the body so that the DNA changes would actually affect the body's morphology. I'm not entirely sure how that would work, because that's the kind of thing that involves stem cells and uterine environments and all kinds of chemical signalling, but it apparently happened, and Geordi's eyes would have redeveloped as part of that.

CRUSHER: There, in the thymus. Some sort of parasite. It's using Susanna's immune system to spread genetic instructions.

OGAWA: How did it get there?

CRUSHER: She could have become infected during the original mission. It's small enough to have entered through any of the mucous membranes. But it certainly isn't behaving like a typical parasite. It isn't feeding off of her. It's transforming her DNA to match its own.

OGAWA: There's not much of her original DNA left.

CRUSHER: And we're going to need unaltered genes or we'll never get her back. We've got to get that thing out of her now.

(The Next Generation Transcripts - Identity Crisis)

Geordi was born blind due to a birth defect (Star Trek TNG Bible, page 7; scanned PDF).

If the birth defect was not caused by a a genetic defect, then the real question is not why he's no longer blind when he's transformed into another creature, it's why he's blind again when he reverts back to being human. And to that I'm sure there's a perfectly reasonable— look behind you, it's a reset button!

If, instead, it's caused by a genetic defect, the re-re-development of Geordi's eyes would result in him being blind again when he's transformed back.

The temporary regeneration of Geordi's eyes in Star Trek: Insurrection only muddies the waters. On the one hand, it suggests that the defect isn't genetic and that his eyes have finally been fixed. On the other hand, clearly something strange is going on, since he's back to having cybernetic eyes in Star Trek: Nemesis.

Either way, the alien creature he was turning into didn't have that birth defect, so his eyes worked when he was the creature.

  • 1
    Geordi also has his eyes temporarily regenerate towards the end of Star Trek: Insurrection. Do we know if the birth defect is a genetic one?
    – Ellesedil
    Feb 16, 2017 at 21:28
  • 2
    @Ellesedil The way it's stated as "birth-defect blind" automatically inclined me to think that it wasn't genetic, but there's no reason a genetic defect couldn't cause a birth defect. Still, since his eyes somehow do temporarily regenerate in Insurrection, I would be inclined to think it's not genetic. Not sure why they'd revert back to being blind after that, though. Hmm... To the edit function!
    – Dranon
    Feb 16, 2017 at 22:19
  • Geordi explicitly says in Insurrection that his eyes working is probably temporary: "It may not last. And if it doesn't, I just - I just wanted, before we go... You know, I've never seen a sunrise? At least, not the way you see them." So given that, it's not a surprise he has implants in Nemesis. But, what is surprising is how it's temporary at all. If it's genetic, then how did his eyes get fixed by the planet's magic radiation? And it it's not, then why was it temporary? Man, there are so many things I don't like about Insurrection. Easily the worst of the TNG movies.
    – Ellesedil
    Feb 16, 2017 at 22:52
  • @Dranon Seems like the scriptwriters once again just make up whatever they want to get through the story without considering whether the story is consistent with other stories.
    – RichS
    Feb 26, 2017 at 22:24
  • @Dranon "— look behind you, it's a reset button!" A look askance. Huh?
    – RichS
    Feb 26, 2017 at 23:19

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