The original pilot had a female as 2nd in command, execs didn't like it. I recall a couple 50's sci fi flicks that had multinational crews. 1st spaceship to venus or something, but ya most of em were mostly white. Uhura was having her mail go missing. Apparently she was getting near what Shat & Nimoy got & someone felt uneasy about it or something. She was gonna quit, & Martin Luther talked her out of it.