Stargate SG1 S04E16 - 2010

It's 2010, ten years since SG-1 made contact with an alien race called the Aschen. With their help, the Goa'uld have been defeated, and diseases such as cancer have been wiped out. The Aschen's advanced technology has not only ensured the planet's safety, but it has won them the respect and friendship of all humanity. But things are not all as they seem to be as Samantha Carter learns she can not have children. Deeper investigation reveals that the various vaccines handed out by the Aschen have managed to sterilize over 90% of the population