Terrifying nightmares about the Wraith cause Teyla to lash out at her colleagues and prompt her to seek professional advice. With psychological guidance, she discovers that she can sense the Wraith. In their search to learn more, Teyla and the Atlantis team discover important information that may hold the key to understanding their enemy, including the disturbing possibility that Teyla's connection to the Wraith could be the result of genetic experimentation.