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From SCIFIPEDIA
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"Lifeline" is episode 2 of Stargate Atlantis season 4 and the third part of a three part episode preceded by "First Strike" and "Adrift."
Spoiler Warning: Plot details and/or information about the ending follow. If you wish to enjoy the work first, stop reading here and return at another time.
Summary
Now on board the Apollo, Carter proposes they cannibalize several key systems in order to extend the range of the sensors. Although that part of the operation is successful, they require numerous hyperspace jumps and sensor sweeps in order to find Atlantis.
McKay successfully completes modifications to a puddle jumper allowing it to open up a hyperspace window. They travel to the Asuran home planet and once there, Weir's reactivated connection to the other replicators allows her to share their knowledge. The ship extends an anti-replicator field down through the city's core and Weir guides Sheppard and Ronon to the ZPM room where they successfully remove the module and return to the ship.
Once back at the jumper, McKay informs them they burned out the drive on their first jump and he'll need to tie the ZPM into the systems to boost the power. In the meantime, he's discovered that the Replicators' programmed command to attack the Wraith was shut down. He wants to reactivate it but Ronon and Sheppard must go deeper into the core with a computer pad to upload the data to the systems.
With Weir's guidance, they find the right location but the pad doesn't work. Adjustments need to be made and they are running out of time. The replicators are getting closer and closer to adapting to the field and are sacrificing themselves to do so. Weir takes matters into her own hands and goes down into the core where she runs into Oberoth and accesses his brain in the same way he once did hers. She creates a scenario in which he comes to believe he has captured all of the team, giving Sheppard enough time to adjust the computer and activate the command. They manage to escape but are forced, on her insistence, to leave Elizabeth behind.
Back in the jumper, McKay, Ronon, and Sheppard attempt to escape but the Replicators are on their tail and their weapons are down. With spectacular timing, the Apollo appears to help them, taking the brunt of the attack so they can make their way into the ship's bay.
Back on Atlantis, the ZPM is installed and the city makes the jump to hyperspace to a planet Weir knew nothing about and therefore the Replicators cannot take that information from her. John successfully sets the city down on the ocean. He later congratulates Carter on her promotion to Colonel. The city is now back in contact with Earth.
Guest Stars
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