Re: Hypothetical: If Paramount ponied up the cash for Shatner to fix S I can see what you're saying, but I can also see the other side of it. It seems clear from Spock's dialogue in TFF that he is very hesitant to discuss Sybok at all. He has to under the circumstances, but it seems reasonable that if he felt that way, he would never have mentioned him, even to Kirk and McCoy. Yes, they're best friends and, yes, Spock has been closer to Kirk than to anyone. But he's still a Vulcan and, even with Kirk, has tried to maintain certain barriers, at least superficially. I'm still trying to think of something in TOS that I would interpret as meaning that Spock is an only child. I suppose that when Spock and Amanda are discussing his childhood, the fact that she doesn't mention any other siblings could imply that there are none. But not necessarily. Don't get me wrong. I'm not too fond of Sybok being Spock's brother either. I think the story could have worked just as well if he were just a random Vulcan outcast who Spock had some vague knowledge of. You would have to rewrite a couple of scenes, such as how he ultimately gets control of the ship after the shuttle returns, but nothing too difficult. But, even so, I still don't see anything from TOS that precludes the possibility of a sibling for Spock.