Are there other universes out there ,paralell or otherwise,very well could be,the theroies abound on this issue
But would/could a person from one show up here in our universe? They would be so far ahead of us scientifically that I am sure we would be no more than a novelity to them
Faster than light travel? There are people working on that now,and they are working on a matter antimatter drive source,but feeding the drive system hasnt been worked out as of yet
There is alot of that Star Trek stuff out there or in devolopment now,just see what the next ten years holds for us