When I saw Captain Thadiun Okona, I was... interested. Marc is the one who remembers actors, their names, etc. I'm pretty bad about such things. Anyhow, the actor was Billy Campbell. He looked like this in the episode:
Looking him up, I was reminded of some of his roles. I also read that he was the first choice to play Commander Riker. No offense to Jonathan Frakes, but... wow, he could have been Commander Riker? I was and am a Trek fan anyhow, but looking at this every week wouldn't have been too much of a hardship!:
Come on, would that have been so much to ask?