I actually think on this topic Hugh Ross really has a lot to say. The Science Fiction paradigm that maybe these are ultra sophisticated creatures has got problems. Namely, the biggest one is that your Captain Kirk person can break a few rules of physics. He can teleport from one place to the next for instance.
But Captain Kirk cannot break all the rules of physics! While Captain Kirk can sometimes teleport, he can be stabbed and shot for instance.
But if you list all the abilities of these creatures and their vehicles they can literally break every law of physics. UFO's can change size at will, and can multiply or reduce in number. They can make turns that are impossible, and stop on a dime at extreme high speed. They can project light beams that suddenly terminate (like the light beam of a light saber). They can sometimes be seen on radar, but not by naked sight, but the reverse is also true at times.
UFO crew-members can walk through walls, and I'm sure there's probably another dozen or two examples of other laws they break.
Anyway when you add up all the laws they break from gravity, light, matter etc. it gets to be a pretty convincing case that you are dealing with something that is "non-physical" (Something that can interact with the physical world, and at times leave behind physical effects but not subject to any of our Physical laws).
I've heard Physicists use Flatland to describe this sort of thing. (How a being from a high dimension would interact with us)
Flatland: A romance of many dimensions