9.
This is one of my favorite episodes of any season.
There's a ton of world building interwoven with some history to make it seem like it's all the same thing, rather than two separate things.
I like the introduction of the historical figures, although I think they pooped out a little with Ghengis Khan being a huge silent guy and Zora did seem a bit lame. But Col Green was super, he is one of my absolute favorite one off characters. I'd love to know how he fit into the war with Khan Singh and the Supermen. I like this Kahless better than any later versions. I love the Excaliban's description of him, "Kahless the Unforgettable, the Klingon who set the pattern for his planet's tyrannies." And that brings me to the Excaliban himself, another great "alien" alien.
And then on the other side, Lincoln and Surak. I liked Lincoln, but Surak was so important to what we know about Vulcan culture. This episode and maybe 2 others really are all we get besides Mr. Spock himself but so many people act like this has been around from the beginning but here it is toward the end of the 3rd season. I really liked the interchange between Spock and Surak, and that he refused to help them fight because it would be against his beliefs.
For a show that got by on so many worlds populated with aliens that looked just like people, when they did have a different kind of alien, they did a good job. I also really like the idea that these people didn't understand the notions of "good and evil" I think it's a great motivation on their part. Why wouldn't an alien culture not understand basic concepts, they would be alien to them wouldn't they? And I love the Excaliban's rebuttal of Kirk's complaints at the end.
ROCK: You are the survivors. The others have run off. It would seem that evil retreats when forcibly confronted. However, you have failed to demonstrate to me any other difference between your philosophies. Your good and your evil use the same methods, achieve the same results. Do you have an explanation?
KIRK: You established the methods and the goals.
ROCK: For you to use as you chose.
KIRK: What did you offer the others if they won?
ROCK: What they wanted most. Power.
KIRK: You offered me the lives of my crew.
ROCK: I perceive. You have won their lives.
KIRK: How many others have you done this to? What gives you the right to hand out life and death?
ROCK: The same right that brought you here. The need to know new things.
KIRK: We came in peace.
ROCK: And you may go in peace.
That really turns it on it's head, doesn't it? The Enterprise's stated goal is to seek out new life and civilizations and when they find one, they want the same thing, to learn new things but Kirk is angry because of the threat to himself and his crew. I understand the anger, but it also seems like a missed opportunity to learn more about the Excalibans. Of course, there's only 51 minutes for the episode and there wasn't going to be any follow ups, they were rare before and when this was made I think they knew there was no chance of that.