When Dr. Keller fails to report for her morning shift, concerned team members investigate and are shocked by what they discover: Jennifer, unconscious in her quarters with a mysterious web of tendrils attached to her body. Suspecting her condition may be linked to her research into the Wraith data recovered from Michael's lab, the team makes the decision to bring Beckett out of stasis.
The beloved doctor leads the medical investigation while Sheppard and Co. are quarantined under suspicion that they may have been exposed to the same virus that has affected Keller. As Beckett struggles to find a solution, the alien organism grows, creeping out into the adjoining corridors toward the main power grid. With Atlantis itself now under threat, Woolsey is ultimately faced with a decision that could cost Keller her life.