The Ancients

Homeworld - Unkown
First Appeared - 'Frozen'
The race that built the Stargate system.
The Asgard

Homeworld - Asgard homeworld
First Appeared - Thor's Chariot
One of Earth's most powerful allies, the ancient and benevolent
Asgard have assumed the personae of Norse mythology on many
protected worlds.
The Goa'uld

Homeworld - P3X-888
First Appeared - "Stargate" the movie
One of our galaxy's dominant species, the Goa'uld are parasites
that forcibly take human hosts -- and possess a thirst for
power and worship.
The Tok'ra

Homeworld - Unknown
First Appeared - In the Line of Duty
Though from the same species as the Goa'uld, the Tok'ra
are a resistance movement who live in voluntary symbiosis
with their human hosts.
The Nox

Homeworld -
First Appeared - The Nox
Though they initially appear unadvanced, the forest-dwelling,
pacifist Nox are one of the galaxy's oldest and most advanced
races.
The Jaffa

Homeworld - Various
First Appeared - "Stargate" the movie
Slaves of the Goa'uld, the Jaffa are humans from many different
worlds, most of whom have been implanted with larval Goa'uld
symbiotes.
The Tollen

Homeworld - Tollana
First Appeared - Enigma
One of the most advanced races of humans encountered by
the SGC, the arrogant Tollan became an ally of Earth.
Replicators

Homeworld - Unknown
First Appeared - Nemesis
Technologically advanced "bugs," Replicators are
capable of working together and assembling their individual
blocks into whatever form they need.
Unas
Homeworld - P3X-888
First Appeared - Thor's Hammer
The strong but unadvanced Unas were once the original hosts
of the Goa'uld, and originate from the same homeworld.
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The Abydonians
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The Bysra
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Chulakians
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The Argosians
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The Cimmerians
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Cartagians
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The Fenri
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Unity Crystals
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Aschen
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The Shavadai
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The Primitive
Cave Dwellers
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Enkrans
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The Touched
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The Nasyans
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Altairans
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The Untouched
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The Oannes
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The Giant Aliens
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The Residents
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The Spirits
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Edorans
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The Salish Indians
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The Badrosians
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Vyans
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Winged Insect
Creatures
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The Optricans
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The Orbans
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Eurondans
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Furlings
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Gadmeer
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Hankans
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Madronans
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Orbanians
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Simarkans
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Taldor
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Tobin
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