Also in regard to the giant Spock, exactly how was Keniclius able to replicate a giant version of his uniform? It would have taken tons of the right fabrics to make an exact recreation.
The usual problems with giant-sized humanoids: as size doubles, mass squares. A giant-sized Spock or Keniclius would be too heavy for their muscles to move them.
So exactly how is a giant Spock going to be particularly useful in conquering the universe? Or even an army of giant Spocks? Even if you want an army of super-smart Spocks to help you, why make them giant-sized? That would seem to make them merely bigger targets.
After Spock is captured by Keniclius, there's a bridge shot with Spock in it before he is rescued.
Sulu: It's a mobile plant. When it stops, its roots bore back into the ground. They're all over the place. I think it likes me.
Kirk: We always encourage our officers to make friends with the natives.
Spock: I am pleasantly surprised at your capacity for deductive reasoning, Captain. When you are not being bellicose, there appears to be no end to your arsenal of formidable talents.
Kirk: By the way, Mr. Sulu, any chance of teaching me that body throw? Could come in handy sometime.
Sulu: I don't know, sir. It isn't just physical, you know. You have to be inscrutable.
Kirk: Inscrutable? Sulu, you're the most scrutable man I know.
This episode along with "More Tribbles, More Troubles" was released on The Animated Adventures of Gene Roddenberry's Star Trek: Volume 1 for VHS.
The budget for the series wouldn't allow them to add the Chekov character, so Walter's contribution to the series was the writing of this episode.
The Kzinti are mentioned in this episode. At the time this must have come as quite a shock to discerning s.f. fans, since they were never part of the Star Trek mythos. Most likely it was already known that Larry Niven was working on "The Slaver Weapon" and going to use the Kzinti, and Walter Koenig tossed it in there.
Walter Koenig named the Retlaw plant (which poisons and almost kills Sulu) after himself. A little wish-fulfillment, perhaps?