Looks like the Enterprise crew has gotten itself mixed up with yet another supreme being. This time, however, they are not the chief threat to our heroes, but rather a third party to a more traditional conflict between the Enterprise and a race called the Gorn. The powerful Metrons decide this conflict is uncivilized, and therefore proscribe an ever more civilized fight to the death between the two captains, promising to destroy the loser's ship. This seems like a highly questionable line of reasoning, but we'll never know if the Metrons would have followed through on their promise because Kirk, in the finest Star Trek tradition, elects to spare the wounded Gorn. Suitably impressed, the Metrons allow both parties to go on their way. Although the intent seems to be for the Enterprise and their foes each to have learned valuable lessons, it looks to me like the only ones getting schooled here were the Metrons. We're also treated to some gladiatorial combat in the meantime. Kirk fights a lizard man and shows up a few gods: what more could you really ask for, huh?