Just starting a rewatch, and although I have seen all of the episodes before, I've never read the books/comics or listened to the audios. It's amazing how well the first episode holds up after more than 60 years! There's a lot to like in the second episode, but it's definitely a step down from the first. I feel the third episode is the weakest of the four. Although there is some nice character stuff happening, there just isn't as much as in the previous episode. The final episode gives us a fairly strong ending to a good (not great) first story. I thought the actor playing Za gave a decent performance with what he was given. I'm giving this story four stars (mainly due to the outstanding first episode), but really it's more like 3.75.