M1B-129 is a planet in the Pegasus galaxy. The world had a hidden Wraith science laboratory. They were experimenting with a Wraith hallucination generator, so they could change their prey's mind against their will. The Wraith gave up the project when the Genii discovered the technology but could not deactivate it and instead accidentally turned it to full power. When the Atlantis expedition came to the planet, the First Atlantis Reconnaissance Team and Major Leonard's team came under the effects of the device, leading to the planet's DHD being destroyed. After the device was shut down by Teyla Emmagan and John Sheppard, the surviving team members were finally able to make radio contact with Atlantis which dispatched the Daedalus to get them off the planet. (SGA: "Phantoms")

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