The Enterprise goes to Ardana to obtain the only known cure to a plague that threatens to decimate the vegetation on the planet Merak II. Kirk and Spock go to the cloud city of Stratos, and find out that the population is split between the Troglytes, who do the dirty work, including the mining, and the people of the city who enjoy good lives on the backs of the Troglytes. When the Troglytes rebel and threaten to stop mining, Kirk must solve the civil war to get the plague cure.
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Warning: Star Trek season 3 episode 21 guide may contain spoilers