Goa'uld

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The Goa'uld (pronounced [ɡoˑɑˈʔuːld] go-AH-oold, commonly shortened to /ɡoʊˈuːld/ go-OOLD or /ˈɡuːld/ goold in English) are a fictional symbiotic race of ancient astronauts from the American-Canadian military science fiction television franchise Stargate. The Goa'uld are parasites from the planet P3X-888, integrated within a host, most of the time human. The resulting creatures are a powerful race bent on galactic conquest and domination, largely without pity, compassion or remorse. They are collectively the greatest extraterrestrial threat to Earth in the first eight seasons of Stargate SG-1 known to the Stargate Command (SGC). They are pejoratively called "snakes" or "snakeheads" by Jack O'Neill. The Goa'uld are the main enemies of SG-1 for most of the series, until they are replaced in this capacity by the Ori in seasons 9 and 10. They also appear in the Stargate Atlantis episode "Critical Mass", and in the DVD movie Stargate: Continuum.
The Goa'uld were created by writers Dean Devlin and Roland Emmerich for the 1994 movie, Stargate. Although the alien race in the film was never named, the pilot episode "Children of the Gods" (1997) established that the alien race seen in the movie are the Goa'uld. In the series it is confirmed that they are a parasitic race which uses hosts to survive. They were the dominant species in our galaxy.

-Wikipedia-