Lifeline (Part 3)

Colonel Sheppard's team and Dr Weir plan a daring infiltration of the Asuran homeworld to steal a ZPM from the Replicators, in order to power up Atlantis and head to their new home. Dr Weir's new powers convince Rodney that he can upload a new attack code to the Replicators, and thereby return them to their ancient war with the Wraith: but it risks exposing her to Oberoth (David Ogden Stiers). Meanwhile, Colonel Samantha Carter and the Apollo search for the lost city.