The most alien alien I can remember is on the 12th episode of Season 1 of Enterprise (Named 'Silent Enemy'). They were very ant-like.
It's too bad those guys were never seen before or since, I found them interesting and the in-universe mysteries about them will probably never be answered.
Me too. I remember the one scene where they were walking past an open corridor and how their weird gate made the hairs on the back of my head stand up. I would have liked to see them return.
The OP got me thinking. Where did we see the most Alien aliens? I'm thinking Aliens (1986). Or maybe Alien Resurrection?
If you ask me Tholians seem more like mineral or silicon based lifeforms to me. They look like they're made up of crystals. Who knows how they might function? Well...duh it's a giant universe out there, there aren't many things that are completely impossible. E Always liked the idea of astrozoans and species floating around in gas giants. We should see more of that. There's lots of stuff on Earth that that looks and feels similar to fur without actually being fur or attached to a mammal: 1) Primitive Feathers 2) There are some "fuzzy" insects 3) Some molds grow a "fuzz"
We don't know what the Q actual look like, assuming they even have a natural form. Perhaps they look like small chicken puppets, and without their magical powers would die and turn to smoke.
Aliens using trunks have occasionally appeared in science fiction. This is actually plausible in terms of science. Thinking back some decades, I seem to remember something like this in the Trek animated series. Book, copyright 2008. "Dolphin Mysteries" by Kathleen Dudzinkski and Toni Frohoff. Discussed cognition. Can animals be self aware? This has been tested with mirrors. Most species react to their mirror images as if confronting other individuals. The animals that seem to get it? Apes, elephants, and dolphins. Not only does this demonstrate intelligence, but also self awareness. BTW, Chimpanzees seem to have trouble comprehending television, but dolphins seem to understand television right away.
Book, copyright 2011. "Dolphin in the Mirror" by Diana Reiss. More about cognition. BTW, magpies have passed the mirror test. The author discusses interspecies empathy. I think humans can feel an affinity with other mammals (but probably not cephalopods), but in the case of dolphins the empathy seems to be reciprocated. Might be significant in contact with extra-terrtestrials, whether such empathy can be extended to a an alien species.
In terms of psychology, the Borg were probably the most alien. A hive mind is conceivable to us, but nevertheless remains alien.
I don't think they have one. Not made of matter, anyway. Energy beings, if that. They perceive the universe in such a radically different way that the concept of a "natural form" probably doesn't even apply to them. If they have one, there's no way that humans could ever comprehend it.
TOS: Tribbles, If you've never seen a shaved tribble, Google it...it's terrifying TNG: I would say the Armus, but it wasn't a product of evolution so I'll say the Crystalline entity and the Devidians DS9: The Breen (Prob) They had a language that was unrecognizable and stayed fully encased I can only guess they were VERY alien. VOY: The Kradin from the episode "Nemisis" and species 8472
You have any examples? Yup, elehphants are a great example of real life. B I want to point out such a creature could have arms too... Correct, seagulls also pass too... Yup