One of Star Trek's better outings, it is certain that I will remember Elaan of Troyius for the costume design. There's the scene where we first meet Elaan, the camera pans up so we can fully enjoy the remarkable uniform Elaan wears. Then there's the purple casual ensemble which she wears in quarters, which evokes thoughts of spanking for Kirk. Then Elaan goes topless (well, with pasties) on the engineering deck. Last, and least, is the shapeless magenta gown. Overall, Elaan is more stimulating than Shawna in her platinum bikini (Gamesters of Triskelion).
Incidentally we have intrigue, sabotage and space combat. Good incidental music in the latter scenes. One of the top ten episodes, I'd say.