I don’t buy into aliens thing. That’s said, the simple law of averages I think there is life somewhere out there in the universe but I don’t believe they have any ability to intergalactic travel.
I don't believe we are alone in the universe and as far as having aliens living among us is a tough one to believe.
We can't get along with people on our own planet so if life is out there it best wait till we get along here first.