This episode takes place a decade into the future: The SG-1 team has been de-activated by the new President, the Goa'uld has been defeated, and all earthly diseases have been eradicated. This has come about thanks to the advanced technology of the Aschen, a seemingly benign alien race. But when the now-married Samantha Carter (Amanda Tapping) is given false information about her inability to bear children, it becomes obvious that the Aschen pose a sinister threat. The former SG-1 team members must send a message to their younger selves in the year 2000 to preserve the future of Mankind.
by Hal Erickson synopsis