2010

In an alternate timeline, Earth has defeated the Goa'uld with the help of the Aschen, a bland and humorless advanced people from a world designated P4C-970. Earth discovers too late that the Aschen plan to depopulate the planet by secretly sterilizing much of the population through life-extending drugs. Thus, the former members of SG-1 sacrifice their lives to send a warning back in time to themselves not to contact the Aschen homeworld P4C-970. The season 5 episode "2001" resumes this story.