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When terrifying nightmares about the Wraith haunt Teyla, she visits the city's psychologist and learns that she can sense the Wraith. Determined to discover more, she leads a small team on a mission to a planet from which victims of the Wraith "miraculously" return. There, they uncover what appears to be a genetics laboratory. Could Teyla's connection to the Wraith be the result of genetic experimentation?