Kirk and Spock are caught up in a revolution on a planet where intellectuals and artists live on a utopian city in the sky while the rest of the population toils in mines on the barren surface below.


Jud Taylor


Gene Roddenberry (created by), Margaret Armen (teleplay by) | 3 more credits »





Episode complete credited cast:
William Shatner ... Capt. Kirk
Leonard Nimoy ... Mr. Spock
DeForest Kelley ... Dr. McCoy
Jeff Corey ... Plasus
Diana Ewing ... Droxine
Charlene Polite ... Vanna
James Doohan ... Scott
Nichelle Nichols ... Uhura
Kirk Raymond Kirk Raymond ... Cloud Guard #1 (as Kirk Raymone)
Jimmy Fields Jimmy Fields ... Cloud Guard #2
Ed Long Ed Long ... Midro
Fred Williamson ... Anka
Garth Pillsbury ... Prisoner
Harv Selsby Harv Selsby ... Guard


In order to save an inhabited planet from being destroyed by a botanical plague, the Enterprise goes to pick up zenite, the mineral cure, on the only known planet where it is mined. When Kirk and Spock beam down, they are attacked by 'troglites' (troglodyte miners) but not captured. High council adviser Plasus intervenes and brings them to Stratos, a luxurious metropolis which literally floats in the sky. However, it is under attack from 'disruptors', troglite revolutionaries who want equal life conditions for their peers. They do all the hard work, mainly toiling miserably in mines and dwell in caves on the barren surface below. Dr. McCoy ascertains that the alleged intellectual inferiority of the troglites is not genetic but the reversible effect of exposure to an invisible gas emitted by the zenite. Written by KGF Vissers

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TV-PG | See all certifications »

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This takes place in 2269. See more »


When Kirk says, "The only way you'll use.... that device again.. is on one of us," He obviously almost forgot his line(s) after "use" and "again." See more »


Mr. Spock: Allow me to point out that a first officer is more expendable than either a doctor or a captain.
Captain James T. Kirk: Officially, yes, but this mission is strictly unofficial. Nobody's to have any part in it, any responsibility for it but myself. That's an order, Spock.
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Alternate Versions

Special Enhanced version Digitally Remastered with new exterior shots and remade opening theme song See more »


Featured in For the Love of Spock (2016) See more »


Music credited to Alexander Courage
Sung by Loulie Jean Norman
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User Reviews

Rich Profiteers vs Poor Hard-Workers
14 January 2017 | by Rainey-DawnSee all my reviews

Season 3, episode 21. The Enterprise is on a mission to the planet Ardana to retrieve the mineral zenite, it is in need to help stop a plague on Merak II. Kirk wants to speed things up so he and Spock beam directly to the zenite mines entrance, ignoring the High Adviser Plasus's request for them to beam to the floating city of Stratos. Kirk and Spock are the lassoed (captured) by the angry miners, a fight breaks out and Plasus shows up with some men and the miners easily back off. Kirk explains that they just wanted to pick up the zenite shipment that was suppose to be ready and Plasus explains that the Troglytes, miners, used a trick in order to get hostages to force the counsel to meet their demands. Kirk and Spock quickly learned then there are 2 classes: the cave-dwelling Troglytes that are the workers/miners who are very poor and the rich Elite cloud-living city dwellers that profit off the poor workers. Plasus requests Kirk and Spock to go to the city of Stratos and they agree. The logical Spock sees how illogical it is for the hard workers to be the poor ones while the rich ones do nothing at all but collect fine art and the profits. Kirk deals with the poor female miner that attacked while Spock deals with the young rich but naive daughter of Plasus. Kirk and Spock finds themselves in the middle of their private war and all they needed was the zenite for Merak II but now the must end the war before they can obtain the much needed zenite. The botanical plague is quickly spreading on Merak II, time is running out.

I find an interest in this episode due to class separation (areas they can live), profiteers vs hard-workers and rich vs poor scenario. Another important point is the rich (Plasus) refusing simple health measures - the masks to protect the Troglytes from the gas that is emitted when mining the zenite.


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28 February 1969 (USA) See more »

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