In the year 2018, SG-1, the designated flagship team of Stargate Command, is sent to investigate a mysterious signal from what Homeworld Command believes to be the lost starship Destiny. While traveling in the Stargate, the team is accidentally sent decades into the future, where they uncover the cruel fate of the lost Destiny expedition. Meanwhile, Lieutenant General Jack O'Neill is close to retirement, but has to deal with a conspiracy theorist who uncovers the truth of the Stargate Program and the lost crew of the Destiny.