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gbgoodies I'm trying to remember...let's see: DeForest Kelley was alone on a stage at UTA (University of Texas at Arlington) and I believe this was after Star Trek III: The Search for Spock and he talked about what it was like filming it, and expressed his desire for the next film's theme (I believe he wanted it to be the crew flying around space having adventure in the Klingon Bird of Prey, kind of a "Magnificent Seven in Space" as he put it). I don't know if he was serious or not as he was smiling all the time and getting big laughs from the crowd. He recited a poem he had written about Gene Roddenberry, called "The Big Bird of the Galaxy," which is what he was generally referred to by cast and crew. I still have that poem around somewhere as they handed out copies of it for free, if I recall correctly. You wouldn't find that happening nowadays!
What I remember about George Takei is that my wife and I were eating at a little restaurant inside the hotel where the convention was taking place, and Takei was just a few tables over with a couple of workers from the con and he let go with that big, deep laugh of his. He was very jovial and upbeat---this was right before Star Trek V: The Final Frontier and he talked about the film and the series of course---I can't remember the particulars. There were two rooms; one where he appeared and talked; another room that was were the big convention room was where they had oodles of things to buy. We just happened to walk out of the room he appeared in as he left the stage and were walking into the con room next door when he came out of a door with the same con workers and as he passed my wife and I he let go with a boisterous "Howdy!" I guess he thought everybody in Texas said that, but I didn't care, it was Sulu saying it to us so all was cool.
James Doohan----The two times I saw him were approximately the same. The first he answered questions ala "what's your favorite episode?" Answer: "The Doomsday Machine." Then the second time a few years later he didn't allow questions, he kind of rudely said, "I'll just tell you answers to the most frequently asked questions." I don't know, maybe he didn't feel good as he was really overweight and sweating pretty profusely through his button-down shirt. He just seemed like he didn't want to be there.
Leonard Nimoy appeared at a hotel in Dallas and he was very cheerful and talked about directing and showed behind-the-scenes footage of filming Star Trek IV: The Voyage Home, complete with bloopers. It was a fun time but we had come with my wife's sister in
her car and she wanted to leave early, in the middle of Nimoy's appearance and that really honked me off but there was nary a thing I could do. Her car, her rules. But what we saw of him was great. He also explained where the Vulcan salute came from: It came from his Jewish upbringing when elders of the Synagogue were praying and the young kids were instructed to turn their heads away as only the elders could face the altar when praying to God (or something like that). But he turned his head and peeked and saw the elders raising their hands with the their fingers parted exactly like the future Vulcan greeting. He learned that it was the Jewish sign for the first letter in the spelling of Jehovah. I believe I got that right---if someone else can correct me, please do so---it's been many a year. But Nimoy himself incorporated that into what we know as the Vulcan greeting.
Anyhow, that's the TOS people I saw. I saw a few ST:TNG people but I'll leave that out since this is mainly original series stuff.