The three M-class planets of Sigma Draconis.
The USS Enterprise in orbit of Sigma Draconis VI.
The surface of Sigma Draconis VI.
Sigma Draconis VI is the sixth planet in the Sigma Draconis system, and one of the systems three M-class planet. The 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.
Sapient life was plentiful on the planet, but on a most primitive level. According to probes, the planet had no signs of industrial development or possessing an organized civilization. The planet's primitive humanoids were picked up at irregular intervals.
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.
In 2268, the USS Enterprise visited the Sigma Draconis 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 encounted five male humanoid natives, known as Morgs.
The foundations for a dead and buried city were later found near a elevator built into a cave. Several hundred meters below the surface, they discovered a highly complex civilization built around the high energy generation source, built 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 live 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 force to live together once again, in a forced attempt to re-establish a civilization. (TOS: "Spock's Brain")
- While in command recording his only log entry in TOS, Sulu inadvertently calls the planet Sigma Draconis VII in said entry. Kirk also inadvertently refers 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.