Unas is a humanoid race named by the Goa'uld that translates to 'the first ones' or 'the first race' or more specifically, the first humanoid race that they used as hosts before Ra discovered the Tau'ri on Earth. The Unas evolved on P3X-888, the same homeworld as the Goa'uld. The Unas are reptilian in nature, possessing regenerative abilities that a Goa'uld symbiote can enhance. (SG1: "Thor's Hammer", "The First Ones")
The Unas were the original hosts used by the Goa'uld on their homeworld of P3X-888. When the Goa'uld eventually learned how to use Stargates they took Unas slave armies with them to different planets. (SG1: "The First Ones")
The first Tau'ri encounter with the Unas was when Colonel Jack O'Neill and Teal'c were trapped by a device called Thor's Hammer on the planet of Cimmeria, they had to defend themselves from a Goa'uld infested Unas that had been trapped long previously. Teal'c explains that the Unas were the first hosts to the Goa'uld, before the parasitic species encountered human beings; humans proved to be a much more suitable host-race for the Goa'uld, as human bodies were easier to repair, and human hands and voices offered much greater expressive and tool-using abilities; the Unas as hosts were phased out. (SG1: "Thor's Hammer")
Although the Unas were phased out as hosts, at least the System Lord Sokar used Unas to collect hosts on a Medieval planet. That is until the Unas was killed by SG-1. Sokar himself was believed to at one point have been in an Unas host. (SG1: "Serpent's Song", "Demons")
On an archaeological expedition to P3X-888, Dr. Daniel Jackson was kidnapped by an Unas named Chaka. After they established a line of communication with, they eventually befriended each other. Chaka took Daniel away to the lair of his tribe, but instead of sacrificing Daniel, as he was supposed to, he pleaded for Daniel's life. The Alpha Male of the tribe refused. As a response Chaka, with the help of SG-1, killed the tribe's Alpha Male (making him the new one) and offered Daniel to join his tribe, an offer he politely rejected. (SG1: "The First Ones")
Daniel later helped Chaka escape (and start a revolt) from a human based society that used the Unas as slave labour. Chaka also helped SG-1 negotiate a treaty with the Unas of P3X-403. These Unas had been enslaved to mine Naquadah for the Goa'uld, but later drove their oppressors away from the planet, since then the mine has been a sacred place for the native Unas. When Stargate Command sent a team to this world to mine, the Unas felt threatened. They in turn threatened the mining team to war on them until they started to negotiate. The Unas would get food and supplies if they extracted the Naquadah for the Tau'ri. (SG1: "Beast of Burden", "Enemy Mine")
Unas possess green blood and are an exceptionally tough and hardy species, significantly stronger and more physically capable than human beings. According to Teal'c, they can travel for much longer distances than humans, at greater speed. They are strong enough to punch or throw a full grown man several meters through the air. Chaka's clan Elder was able to remain standing and continue fighting even after having several dozen rounds from a pair of FN P90 Personal Defense Weapons emptied into his chest, although such massive injuries would have eventually killed him. However, they are unable to withstand higher caliber weaponry such as light machine guns. (SG1: "The First Ones", "Enemy Mine")
A Goa'uld-possessed Unas is even more powerful, with its already impressive natural physical capabilities further enhanced by the symbiote; Goa'uld-controlled Unas are also able to speak perfect English. The Unas encountered on Cimmeria, having survived on a subsistence diet for millennia imprisoned in Thor's Labyrinth, was temporarily knocked out after being shot with a full magazine from a H&K MP5A3 submachine gun, but possessed an exceptional regeneration ability that allow it to survive and recover from such injuries even without the aid of a Sarcophagus, and later to continue fighting even after absorbing a second round of submachine gun fire. The "Demon" Unas encountered on the Medieval planet was able to withstand multiple direct staff weapon shots to the chest without any immediate detrimental effect, although such injuries were severe enough to force the Goa'uld inhabiting it to eventually migrate to a new host body. Goa'uld-controlled Unas could stay in long periods of sleep to survive for a thousand years. (SG1: "Thor's Hammer")
Some Unas also appear to have has natural defense on the back of their neck that protects them from Goa'uld infiltration. But not seemingly not all Unas have this characteristic, meaning that some create bone 'necklaces' for the same purpose. (See technology area).
The Unas speak their own language that varies between planets but is close enough to be understandable by Unas from other planets. Even on a planet where humans and Unas coexisted, the Unas have not been observed to speak any language other than their own. However, Goa'uld-possessed Unas have spoken other languages. It could be argued that Chaka's pronunciation of "Daniel" is at least a partial ability to understand other languages. (SG1: "Thor's Hammer")
On a technological basis, the Unas have not gained the technological advancement that the Goa'uld developed. Instead, the Unas resort to using spears and other primitive forms of equipment. One of their notable developments are necklaces that prevent a Goa'uld from taking an Unas as a host as they have done in the past. (SG1: "The First Ones")
Although when Dr. Daniel Jackson brings Chaka to mediate a dispute between Unas and Stargate Command over mining of the Unas' world, he is shown to be wearing very modern clothing and has lost his previously lurching gait which seems to show that the Unas are capable of becoming 'civilized' if given the proper opportunity. (SG1: "Enemy Mine")
Worlds under Unas control
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