Nichols said she went to Gene Roddenberry, the creator of Star Trek, and announced she was quitting. "He was very upset about it. And he said, take the weekend and think about what I am trying to achieve here in this show. You're an integral part and very important to it."
So that weekend, she went to an NAACP fundraiser in Beverly Hills and was asked to meet a man who said he was her number one fan: Martin Luther King, Jr.
"He complimented me on the manner in which I'd created the character. I thanked him, and I think I said something like, 'Dr. King, I wish I could be out there marching with you.' He said, 'no, no, no. No, you don't understand. We don't need you ... to march. You are marching. You are reflecting what we are fighting for.' So, I said to him, 'thank you so much. And I'm going to miss my co-stars.'"
"His face got very, very serious," she recalled. "And he said, 'what are you talking about?' And I said, 'well, I told Gene just yesterday that I'm going to leave the show after the first year because I've been offered... And he stopped me and said: 'You cannot do that.' I was stunned. He said, 'don't you understand what this man has achieved? For the first time, we are being seen the world over as we should be seen. He says, do you understand that this is the only show that my wife Coretta and I will allow our little children to stay up and watch.' I was speechless."
Nichols returned to the series, which lasted until 1969. She also reprised her famous role in six subsequent feature films, including Star Trek II: The Wrath of Khan, where Uhura was promoted to commander.
For years, Nichols also helped diversify the real-life space program, helping to recruit astronauts Sally Ride, Judith Resnik, Guion Bluford, and others. And she had her own science foundation, Women in Motion.