P3X-421
Astrographical information
Galaxy	Milky Way
Societal information
Race	Humans
Technological period	Stone Age
Under control of	Humans (present), Goa'uld (past)
Out of universe information
Appearances	"Origin"

[Source]

P3X-421 was a planet in the Milky Way galaxy of a primitive human people who previously worshiped the Goa'uld. After the Goa'uld defeated to the Replicators, Stargate Command sent Dr. Lindsay to aid the people. The planet was also visited by an Ori Prior who came to preach about the Origin religion. He was taken from the planet by SG-12. (SG1: "Origin")