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Carter and Jacob/Selmak calibrate the Ancients' weapon to destroy the Replicators. Mind-probed by Replicator Carter, Daniel is given access to his buried memories and takes control of the Replicators invading the SGC and the temple on Dakara. Jacob is able to activate the weapon after Daniel succeeds in stopping the Replicators long enough to allow him to set the controls, but will everyone survive the final seconds before the weapon's energy wave hits?