John 21:24By the way, most people have come to think that the beings we are dealing with are "interdimensional."This is the disciple [i.e., John, speaking of himself in the 3rd person] who testifies to these things and who wrote them down. We know that his testimony is true.John 21:25Jesus did many other things as well. If every one of them were written down, I suppose that even the whole world would not have room for the books that would be written.
What does the Bible say about "interdimensional beings"?
Read the Book of Revelation. There are vast worlds out there of spiritual beings (whatever is meant by that). And there were spiritual beings thrown out of heaven and down to Earth.
It DOES mention the Angels that left their own habitations. They stepped out of the spiritual realm, and into the physical realm. I think God was highly displeased with them.