Realizing that the only way to save Atlantis is to move the city out of the satellite's range, McKay and Sheppard (Joe Flanigan) decide to use their one Zero Point Module and the geothermal power station found in "Submersion" to power the stardrive. Lorne (Kavan Smith) and a squadron of F-302s are sent to temporarily block the beam using a large moon fragment, so that shield power can be redirected into the stardrive. However, the beam resumes as the city lifts off, briefly grazing the central tower before the shield can be restored. Weir is severely injured and is taken to the infirmary by Beckett's replacement, Jennifer Keller (Jewel Staite). Atlantis jumps into hyperspace, but the stardrive unexpectedly shuts down well before they reach their destination. McKay realizes that they are marooned in deep space, with only 24 hours before the shield runs out of power and the city's occupants are exposed to space.