Kirk returns to the planet where he spent time 13 years before. A friend from his previous visit is now leader of his people. While trying to uphold the Federation's prime directive, the Klingons are providing more advanced technology to their enemies. Written by
Did You Know?
The planet they're on is named Neural in the script, but this name is never heard in the show itself. See more
The ape-like creature is referred to throughout as a "Mugato," but in the closing credits it's "The Gumato" (see trivia). See more
[speaking through communicator
Spock, are you alive?
[on the bridge of the Enterprise
An illogical question, Doctor, since obviously you are hearing my voice.
Well, I don't know why I was worried. You can't kill a computer.