In an exhilarating journey through time and space, the story kicks off with SG-1 attending the execution of their long-time adversary, Ba'al, the last of the system lords. However, the event takes an unexpected turn when Ba'al reveals that he has enacted a time travel plan that will erase the SG-1 team from history, fundamentally altering the timeline. Moments after his revelation, everything changes. The team finds themselves back at Stargate Command, only to discover that the world they knew has drastically transformed. Earth is now under the control of the Goa'uld, and the Stargate program has never been initiated.

Stranded in this altered reality, the team must navigate a world where their histories have been rewritten, and old allies are now enemies. Without their familiar resources, they embark on a perilous mission to restore the original timeline. They face the daunting task of locating the Stargate, which remains Earth's only hope for freedom from Goa'uld rule. As they battle against time and a formidable enemy that knows no mercy, the bonds between the team members are tested. Their journey is fraught with challenges as they confront the implications of the altered timeline, wrestling with the question of what sacrifices are worth making to preserve the future of humanity.