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Synopsis:
The U.S.S. Enterprise comes to the planet Ardana to acquire zienite, a rare mineral needed to stop a planet-wide plague on Merak II. The zienite is not available, however, because the miner class Troglytes are rebelling against the rulers of Ardana, who live in the cloud-city of Stratos.
The Stratos-dwellers insist that the Troglytes are naturally inferior beings, but Kirk discovers that the Troglytes are being affected by a gas emitted during mining.
Unable to get both sides to settle their differences, Kirk traps the Troglyte leader Vanna and the High Advisor of Ardana's Ruling Council, Plasus, inside a mine. When the gas takes effect, Plasus realizes what is happening and promises to help the Troglytes. With peace restored, the U.S.S. Enterprise is able to secure the zienite it needs.
| Cast: |
| William Shatner as James T. Kirk |
| Leonard Nimoy as Spock |
| DeForest Kelley as Leonard H. McCoy |
| James Doohan as Montgomery Scott |
| Nichelle Nichols as Uhura |
| Guest Cast: |
| Jeff Corey as Plasus |
| Diana Ewing as Droxine |
| Charlene Polite as Vanna |
| Fred Williamson as Anka |
| Henry Evans as Midro |
| Creative staff: |
| Director: Jud Taylor |
| Story By: David Gerrold and Oliver Crawford |
| Teleplay By: Margaret Armen |
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