Reminds me of a time traveling Star Trek: The Next Generation episode set in like the 1800s, I think something like San Francisco, the aliens were hiding in plain sight within space and time as they had like a different time frequency which I would relate to frames per second to use an analogy which allowed these aliens to hide in like a different like parallel dimension but on earth. They would like travel back in time to abduct the homeless or anybody nobody would miss in order to suck their life force from like soul-sucking vampires.

Your post also makes me think of the concept of pocket universes or dimensions as seen in shows like Fringe. It is said that even shows like The X-Files will present elements of truth which they will sometimes get from like governmental consultants or whatever with the intention to get the general public to perhaps accept some things but also to like dismiss alleged fiction which is often based in elements of truth which may or may not be mixed with fiction in order to play a game with the general public as fiction is often both fiction and non-fiction at the same time which can confuse people regarding the nature of reality.