Hugh
When you put it that way, it just makes me want to know even when I didn't before. You probably have the right idea, though.
There are two of them. A Commander Spock and a Captain Kirk. They came from the U.S.S. Enterprise, and from what I've gathered, they seem to be from ahead of us in the timeline. Captain Kirk hasn't said much, but Commander Spock is irritatingly Vulcan. He seemed to know a lot, but he wouldn't share future details either.