Alpha Site 3

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Alpha Site 3

Milky Way

Controlled by

Stargate Command

The Alpha Site, alpha-numeric designation P4X-650, is a planet in the Milky Way galaxy.


The planet is located 640 light years from Earth. (SG1: "Avatar")


This planet was set up after the previous Alpha Site was destroyed. It was built inside a mountain like Stargate Command. (SG1: "Avatar") Vice President Robert Kinsey was going to go to the Alpha Site when Anubis' fleet arrived in orbit of Earth but the Stargate was dialed into and prevented his leaving. (SG1: "Lost City, Part 2") SG teams that were offworld were told to go to the Alpha Site when Stargate Command went into lockdown. (SG1: "Lockdown") Samantha Carter took Alec Colson to the Alpha Site and took him on a joyride in an F-302. (SG1: "Avatar") SG teams had to go to the Alpha Site when they received 'do not proceed' messages to their IDCs. (SG1: "Endgame") Replicator Carter was directed here so she could help come up with a means of defeating Fifth who had devised a means to resist the Replicator disruptor. Teal'c deployed a Replicator disruptor satellite in orbit which Replicator Carter used to destroy Fifth, who had not devised a protection but was tricked by Replicator Carter. (SG1: "Gemini")

Offworld teams were redirected to the Alpha Site instead of Earth when a possible error in the Earth Stargate was discovered. (SG1: "Prototype") When alternate reality SG-1's began arriving at the SGC, Landry had all offworld teams redirected to the Alpha Site. (SG1: "Ripple Effect") A signal was relayed through the Alpha Site to the SGC from the Daedalus that they were in position to attack Atlantis that had been taken over by the Asurans. (SGA: "The Return, Part 2")