Yep - great underrated ep. The review was spot-on.
I never knew that about Gosheven's voice being overdubbed by a different actor like that.
I normally am bothered when things like that are done poorly and obvious. (It happens frequently in Star Trek.)
I always thought he gave a decent performance for a guest actor, so that means they did a great job of dubbing. I never would have known!
I never thought about the resemblance between the Shelliak and the TOS aliens from "The Savage Curtain." Maybe there's a little superficial resemblance, but they don't seem at all like the same race to me.