The Jaffa Resistance assembles an army to retake a holy city, while the System Lord Baal seeks help from Earth when he is faced with an enemy common to both of them.
As the entire galaxy falls under a new threat from the Goa'uld, Daniel must once again decide whether to risk death or ascend when Oma Desala gives him a second chance. O'Neill and Carter struggle with their respective personal relationships.
SG-1 travels back in time in a daring plan to steal a piece of Ancient technology from Ra, the powerful Goa'uld who ruled in ancient Egypt.
With the timeline changed by SG-1's actions in the distant past, an alternate version of SG-1 must use the newly-discovered time ship to set things right.
Lt. Colonel Cameron Mitchell, the newest member of the SG-1 team, sets out on a mission with Daniel Jackson, Teal'c and Vala to uncover a stash of ancient riches.
Still bound together by the Jaffa bracelets, Daniel Jackson and Vala are transported to a distant galaxy populated by worshippers of a strange and potentially threatening authority.
Daniel and Vala learn that their reactivation of an Ancient communications device has inadvertently exposed Earth to the wrath of a group of unforgiving deities.