I believe so, some even say aliens/extra-terrestrials/inter-dimensionals are humans (or an evolved form of humans) from the far distant future. If you believe in aliens that is.
In my opinion linear time is an illusion, all threads of time are connected, the past/present/future is happening this very moment.
Ever heard of the Mandela effect? This would probably be an example of other dimensional activities taking place. Different dimensional time-lines start to overlap one another.
Of course, this is all to entertain ones own thoughts, it's up to you to decide what to believe or not.
RE: Is Time Travel Really Possible?