The Enterprise is snagged by an unknown force near a barren planet, and Sulu and the captain are kidnapped. Upon beaming down to search for them, the landing party finds itself the unwilling guests of the quirky Trelane (William Campbell), a strange lifeform with unusual powers and particular tastes for being amused.
"The Squire of Gothos" is a lot like its central character Trelane: It can be fun to watch but it's ultimately undisciplined and meandering. The story provides Kirk with one obstacle after another, as he and Trelane become adversaries in a series of potentially deadly games, but few of these gimmicks enhance the storyline. More is not better. Also, this episode isn't sure if it's out-and-out comedy or something more relevant.
The ending sequence is overly obvious and overlong, with a theme (a powerful being turns out to have the mind of a child) that is little more than a rehash of the far superior "Charlie X," which had a far more sympathetic antagonist. Sure, some of the gimmicks are interesting, and Campbell does a good job with a selfish character, but it's not enough.