It resolves the long-running story arcs of the Goa'uld, the Replicators, and the Jaffa Rebellion, and are regarded as two of the most popular episodes of the series.
At Stargate Command, Jacob Carter, host to the Tok'ra Selmak, brings grave news to General Jack O'Neill: the Replicators have begun a full-scale invasion of the Milky Way.
They decide on an audacious, last-ditch plan: with Ba'al's forces occupied and fighting the Replicators, the entire rebel army will capture Dakara, the holiest of Jaffa planets, thus proving once and for all that the Goa'uld are not gods.
After a ruse in which she pretends to be Oma Desala, she finds what she wants: the location of the only weapon in the galaxy capable of stopping her, hidden in the temple on Dakara.
Sam and Jacob discover the superweapon controls hidden behind a wall in the Dakara temple, and realize that it can be calibrated to emit a Replicator disruptor wave.
Ba'al slows the advance of his fleet to buy them more time, and appears on Dakara in hologram form to lend his assistance.
On Earth, O'Neill and several other survivors are cut off from the surface and fight desperately to hold off the Replicators while attempting to dial the Stargate.
Although Replicator Carter soon breaks free and stabs him, his actions give Sam and Jacob the few seconds needed to finish their work.