Sigma Draconis VI
Sigma Draconis VI was the inhabited sixth planet in the Sigma Draconis system of the Alpha Quadrant. Classified as M-class, the planet was the home of the Morgs and Eymorgs. The planet had one moon.

The position and orbital path of Sigma Draconis VI was depicted on system maps that were displayed on the main viewscreen of the  bridge in 2268. 

In that year, this planet was several thousand years into a glacial age, with a maximum high temperature of 40 °F. Only a small tropic zone existed on the planet that remained ice-free. 

Sentient life was plentiful on the planet, but on a most primitive level. According to probes, the planet had no signs of industrial development or organized civilization. As the probes detected primitive humanoids at irregular intervals, the instrumentation of these spacecraft also detected regular pulsations of generated energy.

Overall, however, Sigma Draconis VI was a remarkable example of a retrograde civilization. At the peak, it was advanced beyond 23rd century Federation capabilities, but had de-evolved to primitive level, beginning 10,000 years ago when a glacial age reoccurred. An underground complex was developed for the women, while the men remained above, causing a male-female schism. This ultimately caused a cultural development which was last seen on old Earth when the Romans were warring with barbarians.

The  visited the Sigma Draconis system in search of Spock's brain. Once reaching the system, Uhura detected high energy generation on the planet. 

Kirk took a gamble and beamed down to the planet's surface. Almost immediately they encountered five male humanoid natives, known as Morgs. 

The foundations for a dead and buried city were later found near an elevator built into a cave. Several hundred meters below the surface, they discovered a highly complex civilization built around the high energy generation source, based on ion power. 

This civilization was discovered to be the home to what the Morgs referred to as the "givers of pain and delight," otherwise known as the Eymorgs. 

The civilization, itself, was controlled by the Controller, which was responsible for keeping the Eymorgs alive for a period of 10,000 years, and for whom the Eymorgs lived to serve.

Following the disconnection of the Controller (which was "powered" by Spock's brain), by the crew of the Enterprise, the Morgs and Eymorgs were forced to live together once again, in a forced attempt to re-establish a civilization. ()

In the 24th century, Lieutenant Commander  , a crewmember aboard the , was born on this non-Federation planet. In 2369, his planet of origin was listed on the chart "USS Enterprise Personnel Database", which was seen on Jean-Luc Picard's PADD. (, okudagram)

Appendices

Background information 
This planet's quadrant of origin is inferred based on the position of its star system as seen in the star chart appearing in the  episode .

For the  remastered version of the episode "Spock's Brain", an all-new computer-generated version of Sigma Draconis VI was rendered. The new, more realistic planet featured landscape more consistent with the look of the surface. Specifically, its non-ice-covered portions were changed from a blue hue that suggested large oceans to an ocher that matched the color of the surface. The  glacier-free areas were also more narrowly concentrated around the tropics of the planet, as the script suggested they should have been. 

In addition to new shots of the Enterprise entering and leaving orbit of the planet, old footage of the landing party beaming to the surface was tracked into a brand new matte painting which expanded the scope of the original shot, showing a more mountainous and snow-covered landscape. 

While in command and recording his only log entry in TOS, Sulu mistakenly called the planet "Sigma Draconis VII". Kirk also mistakenly referred to the planet as "Sigma Draconis VII" in his own later captain's log, even though he himself referred to the planet as "VI" twice earlier in the episode.

According to Star Trek: Star Charts (pp. 18, 19, 34, 44) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Sigma Draconis system was located in Sector 004 (Sigma Draconis sector). The Morg and the Eymorg formed a congress in 2268 after the crew of the  reintegrated the civilization. In 2370, there were an estimated 1.3 million Morg and Eymorg living on Sigma Draconis VI. This was a Federation system in the late 24th century.

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