I sometimes wonder what would have happened if Leonard Nimoy had bowed out of Star Trek. Wanting back in after having a good time with Star Trek II, what if the studio had said, "Sorry, you made your bed, and now you've got to sleep in it", or Nimoy just decided to call it quits and ride off into the sunset? I know about all the talk of the Xon character slated for The Motion Picture to replace Spock, but I can't really imagine how that would have panned out. Sort of like Cheers replacing Coach with Woody, you're kind of getting the same thing...but not really. I can see the Mad magazine parody now: a Mort Drucker Kirk telling Xon something like "You're supposed to have emotions, Spo...eh, I mean Xon. That way people won't think you're a rip-off of Spo..I mean, the guy you replaced!" And what would happen to Xon if Nimoy decided to come back, like a proto-Denise Crosby? Does Xon get kicked out, or is he relegated to a background role like an interstellar Potsie? We'll never know, of course, but I'm glad it worked out as it did.