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After a long night of work on an Ancient device found in Glastonbury, England, Carter achieves a breakthrough. As Mitchell looks on, she activates the device ? which unexpectedly shifts them both into a different dimension. Invisible and powerless, they can now only observe as their friends try to figure out where they've gone.A distress call from the Sodan warriors interrupts Teal'c and Daniel's search. Teal'c and SG-12 hurry to the Sodan homeworld, where a brutal massacre has taken place. The Sodan leader, Haikon, clings to life as he explains what happened. A Prior of the Ori turned one of the warriors, Volnek, into an irrational killer. Wearing a Sodan wrist device that makes him invisible, Volnek butchered his comrades and is still stalking the area. Because warriors wearing the wrist devices can see each other, Teal'c puts on a second device and sets out in pursuit.On Earth, Dr. Lee discovers lepton radiation near the Ancient device. Daniel, recalling that leptons were associated