It’s a new idea that aliens may be beings from another dimension or beings from a multiverse. It’s not a weird thought. Why couldn’t it be that beings from another dimension have found a way to peak into our world. We would do the same if we knew how to do that, if we even knew what the other dimensions are in the first place.
But are beings from the multiverse or other dimensions extraterrestrials? The dimensions are present on our own planet. We may not have discovered them, but they are present in our environment. The same goes for the multiverse. It’s another reality but still on Earth. It’s like the stepping in the Long Earth series created by Terry Pratchett and Stephen Baxter. With each step you reach another parallel world but you are still on earth. In reality it won’t be as easy as with a box and a potato (then again, who knows), but even when you are in a place you won’t recall as being in Earth, you haven’t left the planet.
There are many ways in which people describe their encounter with an alien, a grey, or any other type. Some people even describe seeing the being only half. This could suggest that indeed the beings are from another dimension or a multiverse, and are peaking inside our world. They may not even realise that they are being seen. It would make sense in some cases.
Does that mean that there are no extraterrestrials? The universe is big. And if in that big universe various dimensions and multiverses exist, just try to imagine how many different possibilities exist in which life could have spawned. We might see Mars as a dead planet, hypothetically speaking the planet could be teeming with with life, just in a different multiverse than we are in. Run this through the entire universe. Mind blown yet?
I very much believe extraterrestrial intelligence exist and that there is a possibility they have been on our planet. Whether in our multiverse or a different one is up to debate. There is more to life and the universe than the naked eye is able to see.