Charlie X
Charlie is a boy raised by aliens with no human contact, given abnormal powers to help him survive. Kirk must teach him how to behave in society.
Here we glimpse into life aboard a starship, with an intruder into normal operations: an obnoxious teenager with super powers. His antics fill most of the running time, though none are especially wondrous or horrific. (The "real turkeys" line is funny though.) The best scenes occur when the crew tries to teach him life skills, since their own quirks are displayed. Everyone`s advise relating to men and women is especially odd. Yeoman Rand is a sweetheart but no pushover, and Spock is first to suspect something's up with "the boy." The captain is spared a difficult choice through deus ex machina. He would have done anything necessary to stop Charlie, given what we see in Where No Man Has Gone Before - which has a more tragic resolution.
Spock Saves the Day: He actually does little more here than offer advice. Kirk follows roughly half of it, a common scenario.
Oops: When playing chess with angsty teens, go easy, since they don't appreciate losing and might just melt your game pieces.
Developments: Two of Spock's hobbies are established here, 3D chess and the Vulcan lyre. Both are played in social contexts. Kirk seems to be growing closer to his first officer, though he's still adjusting. Unlike the human characters, Spock has no attachment to Charlie and wishes to maintain the safety of the ship. This might strike some as cold, but the others come to see things his way.