I was just contemplating the good Vulcan doctor and her seemingly random single appearance in 'The Schizoid Man.' I've been trying to determine why it was necessary to create the Selar character for the episode? I'm not complaining, as I really like Suzie Plakson in all her Trek incarnations, but it just puzzles me a bit. I understand that in the episode there was a medical emergency that precluded Pulaski's full attention from being directed at Dr. Graves, and this is certainly the in-universe reason, but I can't help but wonder what the real-world dramatic reason was? What could Selar do that Pulaski couldn't? Did they create Selar to test the waters as a potential Pulaski replacement? Thoughts?