Overview
"Reckoning" is a two-part episode from Season 8 of the science fiction television series Stargate SG-1. 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. This episode was nominated for an Emmy Award in the category "Outstanding Special Visual Effects for a Series" and a Leo Award in the category "Best Visual Effects".)
Plot
Part 1
The episode begins with an emissary of Ba'al demanding the surrender of Yu and the remaining Goa'uld System Lords. Unexpectedly, Samantha Carter is brought before them, revealing herself to be Replicator Carter as she stabs Yu and her Replicator ship advances on the Goa'uld space station. Elsewhere, SG-1 and Bra'tac are preparing for a rebel Jaffa mission when they come under attack by a Replicator-controlled Ha'tak. Their ship becomes infested, and Jackson is beamed away by the Replicators. 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.
Thor of the Asgard arrives to assist in modifying the Replicator disruptor so that it is once again effective. Although he and Carter successfully modify the disruptor, the Replicators adapt after only a single shot and infest Thor's ship. Meanwhile, Teal'c and Bra'tac are dismayed that, in the face of this unstoppable foe, the Jaffa are re-pledging their loyalty to the Goa'uld en masse and the future of the Jaffa rebellion is in doubt. 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. The rebel Jaffa find the planet lightly guarded and quickly seize its temple. However, at the behest of a robed figure, Ba'al breaks off the battle with the Replicators and sends his entire fleet towards Dakara.
From Wikipedia (CC BY-SA 4.0).