P3X-666
The city of P3X-666
Astrographical information
Address
Galaxy	Milky Way
Societal information
Race	Uninhabited (present) Ancient (past)
Technological period	None, present formerly advanced
Earth interest	Ancient city
Under control of	None, formerly Ancient
Out of universe information
Appearances	"Heroes, Part 1", "Heroes, Part 2"

[Source]

P3X-666 is a planet in the Milky Way galaxy. When the Tau'ri arrived here for exploration, Ancient ruins were all that remained. The Goa'uld ambushed SG-13 and SG-3 here. SG-1, SG-5 and a medical team were sent in to extract the SG teams. It was on this planet that Dr. Janet Fraiser was killed by a Goa'uld staff weapon. (SG1: "Heroes, Part 1", "Heroes, Part 2")