The fascination that science-fiction and super-hero stories generate is, in a way, the same that myths, legends, and epic sagas have always generated. The soul, the consciousness aspect in ourselves, always aspires to broaden the spectrum of its consciousness, which eventually leads to the possibility of becoming conscious of other realities, worlds, and dimensions. Whether or not we believe that these other realities exist is totally unimportant. The very idea of these other places and types of existence is intriguing, attractive.
As strange as it may seem, the existence of an infinity of other dimensions, other forms of life (intelligent or not), other inhabited worlds, and extra-planetary civilizations is in no way surprising for the soul. The fact that many doubt this, for lack of scientific evidence (or any other reason), stems from the fact that their consciousness is veiled by the temporary demands of physical incarnation. These veils take many forms. From a strictly physical point of view, consciousness functioning through a body has a strong tendency to believe that the senses of this body are its only way of exploring reality and knowing its possibilities. The 5 senses have no other function than to allow consciousness to be aware of the dimension to which they belong - this physical, empirical world. They are limited to that. Therefore, if consciousness is too identified with its physical body, if it believes that it is the body (when it is not), then, of course, the idea of an infinity of worlds and even an omnipresence of life in the cosmos will appear as a crazy idea. What is crazy, rather, is the idea that life is limited to our sensory spectrum, or that our sensory instruments provide a just and complete assessment of what may or may not exist.
Another form that these consciousness-limiting veils take is psychical in nature. Consciousness is efficiently locked in a prison of psychic attachments, formed of desires, emotions, and thoughts (beliefs, opinions, dogmas, paradigms, etc.). Such a prison is sometimes called the "common sense" of a particular era. It is the mental prison of a rather uniform vision of the world, accepted by most of the population. Such a type of limitation prevents many people from seeing beyond what they can admit to be true, valid, or real.
We should know that these veils exist and that they have nothing to do with the nature of consciousness itself. When free from these veils, it is obvious to all consciousnesses that there is an infinity of dimensions and worlds inhabited by just as many forms of life. When partially free from these veils, perhaps it does not seem so obvious, but a part of the soul knows it and this can sometimes be reflected in the incarnated consciousness. It can then feel inspired to create something called "science-fiction".
This is where the idea of "spiritual realities behind science-fiction" becomes full of sense.
The reality of the soul, that can sometimes become partially (at first) aware of what is happening in other worlds.
The reality of the soul that is not limited to only one dimension.
The reality of the soul that can easily come into contact with inhabitants of other worlds and other dimensions.
The reality of the soul that is not limited to time and space according to the ordinary meaning given to these terms, according to the current understanding that our civilization has of these terms.
What is interesting, is that none of this is really new, nor particularly special. This is the nature of things and it has always been so, even if it still remains largely unknown.