A plague of sorts is spreading across the Pegasus galaxy and Dr. Keller estimates that hundreds of thousands will die if they don't don't find a way to stop it. Her research shows however that the disease's origin is with the Hoff, who had been working on a way to kill the Wraith. Sheppard and the others think they know who might be spreading the virus and why. Teyla meanwhile believes she is receiving messages from Kanaan, the father of her child. She's getting his messages while sleeping and most think she's just dreaming. She follows the clues he gives her but she is taken prisoner by an old enemy who has very specific plans for her. In their search for Teyla however, Sheppard and McKay find someone completely unexpected.