Henry Fonda kicked off a dispute over a beer ad that almost kept Spock from appearing in The Motion Picture.
Leonard Nimoy used his celebrity to encourage others to quit smoking. He signed this American Cancer Society poster for me in 2006. And then, weirdly, Shatner signed it too.
The Making of Star Trek is one of the most important books in TOS fandom, and Gene Roddenberry was an early advocate of the project.
Two guys pulled on the Gorn wetsuit costumes on the set of Arena in November 1966. I was fortunate to spend 20 minutes chatting with Bobby Clark, the better known of the two. Clark asked why Star Trek and the Gorn mattered to me.