Lieutenant Palmer, communications officer, U.S.S. Enterprise; she was the other featured player on Star Trek. She first appeared in "The Doomsday Machine" and I'm positive she made another appearance*, she was a stern officer like Uhura, probably was better, but no one will ever know**. There wasn't enough of her and would've liked to see more of her through out the run of the series. Featured players were not supposed to be part of the ensemble, Shatner, Nimoy, and Kelley, she just filled in for the story told.
*And please don't respond to me on what other episodes she's been.
**Uhura fans no need to respond to how valuable she was, I understand she represented the minority symbol of the series. This thread is about underrepresented characters. I think Palmer was one.