Today I believe that most UFOs are literally transports from hell.
Uhm, last time I checked, Hell is supposed to be underground, not in outer space…
By that I mean they are powered and flown by devils and demons. Have you ever noticed how closely sketches of ETs resemble demons?
Hmmmm, I assume you mean these stereotypes?
image
Nope, sorry, don’t see it.
Anyway, outer space in fiction has a LOT of things. From the aformentioned greys, to green/blue/red space babes, to alien robots, to shapeshifters, to energy beings, to hordes of planet-looting alien locusts, to humans with rubber foreheads, to pretender gods, to eldritch horrors… But I don’t often see conventional demons amongst them, tbh…