S4, E16: It's 2010 and a lot has happened in ten years. The Goa'uld have been defeated and diseases such as cancer have been wiped out. Earth's saviors are an alien race known as the Aschen. Their advanced technology has not only ensured the planet's safety but it has won them the respect and friendship of all humanity. In spite of vast medical advancements however Maj. Samantha Carter and her husband Joe are unable to conceive a child. The Aschen doctors insist that Carter is fine but Dr. Fraiser's tests reveal something very different: The Aschen have been lying all along. Carter's investigation reveals an insidious plot to wipe out the human race through a process of slow attrition. Dealing with this insidious alien threat seems virtually impossible. The Aschen have become entrenched in Earth society. They hold all the reins of power. Challenging them would mean certain defeat. Finally SG-1 comes to realize that there is still hope - ten years in the past.