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A rare gem, this is a clip from Gene Roddenberry’s first show, The Lieutenant, featuring Nichelle Nichols, Don Marshall (Lieutenant Boma in The Galileo Seven), and Gary Lockwood (Gary Mitchell in Where No Man Has Gone Before).
According to wikipedia, this particular episode,
…was never even transmitted, nor would the network pay for it. That installment, titled “
To Set It Right” and written by
Lee Erwin, was about race prejudice, and featured
Nichelle Nichols as the fiancee of a black Marine. The subject of race was considered taboo in entertainment television in 1964, and because the network refused to transmit or even pay for “To Set It Right,” MGM had to eat the entire cost of production.
It’s definitely clear that Gene had some things to say about humanity and simply used the medium of television to put it out there, both here and in Trek.
source I think it's telling of just how relatively little Nichols got to do because of attitudes like those expressed above, that Nichelle Nichols had more lines in that one scene than in any of the Star Trek episodes or subsequent films.
FYI, Leonard Nimoy also guest starred on The Lieutenant and the writer of the banned episode, Lee Erwin, also penned the Star Trek episode
Whom Gods Destroy.