The Goa'uld (pronounced go-a-OOLD , commonly GOOLD, or go-OOLD) are a fictional parasitic alien race in the science fiction television series Stargate SG-1 universe. They look like snakes but they normally insinuate themselves into the brains of large animals, which they can then control. They find humans particularly suitable as hosts.
Most Goa'uld pose as gods to control slave armies and are considered evil, egocentric megalomaniacs by those who do not worship them. "Goa'uld" means "God" in the Goa'uld language. The higher echelon of Goa'uld formed a loose association of System Lords. However, there exists a rebellious offshoot of the species, the Tok'ra, that rejects the God/Slave paradigm of the mainstream Goa'uld and prefers to merge only with voluntary hosts. A singular Goa'uld is sometimes referred to as a symbiote, more often when the host and parasite have a free, benign, synergetic relationship as with the Tok'ra.
The Goa'uld were the primary enemies of SG-1 for most of the series, although in Season 9 they were supplanted in this role by the Ori after the fall of the System Lords.
The era of the political dominance of the Goa'uld over the galaxy is believed to have begun soon after Ra's discovery of human hosts sometime in the ninth or eighth millennium BC and lasted until the Replicator invasion of the galaxy in 2005.
The Goa'uld are so egomaniacal that the term Goa'uld means either "Children of the Gods" or "Gods" in their language. There is still debate as to whether the Goa'uld assumed the names of deities that humans already worshiped or if the Egyptian, Chinese, Japanese, Hindu, Mesopotamian, Greco-Roman, and other ancient mythologies stem from the Goa'uld's one-time domination of (ancient) Earth.
The most powerful Goa'uld are called System Lords. They rule several planets, lead huge armies of Jaffa warriors, and maintain fleets of powerful spaceships that resemble pyramids. Major Goa'uld System Lords included Apophis, Ba'al, Heru'ur, Cronus, Nirrti, and Yu. Osiris and Anubis were former system lords. Many of them have since died during the progression of the show. The most powerful System Lord was Ra — until the Tau'ri killed him in the 1994 movie Stargate.
Goa'uld are able to pass their memories directly to their offspring through genetic memory. This can also occur when a pair of Goa'uld hosts mate and produce an offspring; the resulting child is biologically human but possesses the knowledge of the Goa'uld. Such a child is known as a Harcesis and is considered an abomination by the Goa'uld, who do not normally choose to produce them. The genetic memory is considered to be a contributing factor in the cruel and power hungry nature of the Goa'uld—essentially, they are born evil.
A Goa'uld-occupied host usually speaks in an eerily flanged, bass-augmented register, except when allowing the host to act freely, or imitating a normal human- recently however, one Goa'uld has stated that the voice is not necessary, and that they can talk in normal tones. The voice may simply be used to differentiate between host and symbiote (as the Tok'ra do) or to frighten slaves; extreme emotions in the Goa'uld or when the goa'uld takes control causes the host's eyes to briefly glow. The Goa'uld instill increased strength and remarkable healing abilities in their hosts; the host can continue to function even after sustaining injuries that would incapacitate or kill most humans (although the destruction of their vital organs is still immediately fatal for them) and experiences a lifespan of centuries (which System Lords commonly extend almost indefinitely through the technological means of a sarcophagus). Being a host is regarded as a living hell and those hosts who have been under the control of Goa'uld for extended periods of time are widely suspected of having gone insane. Most of the Goa'uld killed in Stargate SG-1 have been in a host at the time, who died along with them. The death of the host in these instances has generally been considered merciful. If any attempt is made to forcibly remove a Goa'uld from a host the Goa'uld may release a deadly toxin into the blood stream of the host, killing the hapless individual. Nevertheless, the Tollan and the Tok'ra have found a surgical method of safely removing Goa'uld parasites with only minimal risk to either party, and the Asgard technician Hermiod recently discovered a method of removing a Goa'uld parasite using Asgard beam technology ("Critical Mass").
Goa'uld are parasitic in a technological sense as well. While many races in the galaxy, like the Asgard and the Ancients, developed their own technology over many thousands of years, the Goa'uld achieved their current level of technological strength by discovering or stealing the technology of other races and adapting it to their own use. It is unknown if any individual pieces of Goa'uld technology were actually developed originally by the Goa'uld themselves; more often than not, the Goa'uld, in their arrogance, will claim to have 'invented' a piece of technology that they in fact did not. There is little doubt, however, that the Goa'uld do have inventors and technicians, who have been seen to improve earlier technolgies (for example, extending a cloak around an entire Ha'tak mothership, as in "The Serpent's Venom") The Stargates themselves are a prime example of this; while they were created and built by the Ancients, the Goa'uld have controlled so many of the galaxy's Stargates for such a long period of time that they automatically take credit for their invention. This fiction is just another of the claims that helps reinforce the Goa'uld's position as gods in the minds of those who are ruled by them.
Possibly because the Goa'uld spend no time developing new technologies, only improving existing examples, and they likewise keep their servants from innovating and expanding, Goa'uld society has not changed in noticeable degrees in the millenia since they originally contacted the Tau'ri.
The Goa'uld are a strictly parasitic race. They rely on hosts for life, Jaffa for strength, and deception for power. Their technology is no different. The Goa'uld are scavengers, and their technology is a conglomeration of the discoveries and ingenuity of multiple races, including the Ancients.
All (or the vast majority) of their technology contains, in some form or another, naqahdah, the material of which the Stargates are constructed. This material also flows in Goa'uld veins, and is often used as a key to their technology, much like the ATA gene. The devices of the Goa'uld, it will be noted, are mostly warlike in nature, reflecting the megalomaniac nature of the species.
An Ashrak usually uses a Harakesh (aka Ashrak device), which is a smaller version of the Goa'uld hand device, taking the form of an elaborate ring. Its function is to kill the Ashrak's victim, but it is also frequently used to torture victims into releasing information. It is also capable of affecting other people to make them obey the Ashrak's commands. Afterwards the victim remembers nothing of the Ashrak.
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