One book isn't the defacto on what happened when it's already established that there's 23523523523 stories of what actually happened behind the scenes on the set. What I see on that show completely contradicts whatever the heck the producers are trying to say. If the show wasn't trying to push Uhura into the back they wouldn't have had suits standing on set during the shooting of Plato's Stepchildren or reduce her lines or slowly reduce her to silently sitting behind Kirk throughout an entire episode by S3.
I referenced
Inside Star Trek: The Real Story to disprove the commonly printed assertion that NBC forced Roddenberry to eliminate the Number One character. What Uhura has to do with that point, I don't know. If you'd like to read a different book that presents the same explanation for Number One's disappearance after "The Cage" try Joel Engel's biography, "Gene Roddenberry: The Man and the Myth Behind
Star Trek."
As far as Uhura is concerned, I didn't perceive that the show was trying to push her to the background any more during the third season than in the first two. She was in the background from day one, with little effort made to foreground her character at any point.
Nichols said it herself in the interview that she had a contract and her agent called her with news from Roddenberry telling her that the studio was about to buy her out the show and that in order for her to stay on the show she had to been changed to a day player. Only way they could afford to pay her? She sometimes came out of an episode making more than Shatner, Nimoy and Deforest because she'd make over time pay. It had cost more to keep her on a daily on a few episodes...
The assertion that she sometimes made more on an episode than one of the three stars is pretty suspect. She was being paid very little for her acting services (too little, in my opinion), according to everything I've read.
I'm not an expert on the point-by-point of her time on the series, but I do know that she was initially hired as a day player on "The Corbomite Maneuver." Most of her lines were originally delivered by Bailey before Roddenberry inserted her character into the script (close to the last minute).
Why would they have contracts and deals that were never signed? They would only have the agreements that they signed.
In addition to contracts, there are also internal memos outlining how the supporting players were to be paid. For more specifics, you'll have to wait to see the documents yourself. Unless I get a grant to do more research this summer it will probably be a while before I have a chance to get back to the Roddenberry Papers.
Of course, you could also just go ahead and read
Inside Star Trek: The Real Story, which might be one of "23523523523" accounts of the production of
Star Trek, but it's also the best one that's been written thus far. It is both well-researched in terms of primary sources (mainly, the Gene Roddenberry papers at UCLA, but the papers held by Solow and Justman are consulted as well) and in seeking the input of as many people involved with the series' production as were still alive at the time.
Roddenberry's own account of the series' production,
The Making of Star Trek, is incredibly self-congratulatory and littered with errors that flatter Roddenberry's character and his audience. At one point, for example, the book claims that overseas sales agents for NBC wanted the show to make its cast more white for sales reasons. In fact, an internal memo by Roddenberry describing his meeting with overseas sales agents describes them wanting just the opposite!
I do not agree that NBC and Desilu sat at the table with Roddenberry with big grins, twinkles in their eyes, and great hopes of revolutionizing the world through the great epic moral tales of a rainbow crew coming together to work towards discovering brand new worlds nor will I ever agree that Star Trek deserves all this recognition and praise for "ground breaking television" on race and women's rights.
I think it deserves some praise, but that praise must be pretty measured. The integrated cast is commendable, but it must also be noted that Sulu and Uhura had the thinnest characters of the principal or supporting cast (to the point where both could be replaced with other characters with little change to the script). It's curious that they're the only major recurring characters without first names (Spock's first name, of course, being "unpronounceable").