Show and Tell (S02E20)

A young boy gains entry to Stargate Command and tells SG-1 that he has come with his mother, a member of the invisible Reetou race. The boy, who asks to be called "Charlie," after O'Neill's dead son, announces that the Goa'uld destroyed his homeworld, Reetalia, and Reetou rebels now intend to kill all human beings. The rebels believe that by killing all potential hosts for the Goa'uld, they will gradually eliminate the Goa'uld themselves. Charlie's mother created him to serve as an intermediary between the Reetou and humans, and to warn them of the coming rebel attack. Unfortunately, because of Charlie's accelerated growth, his internal organs are now failing. Unless he receives expert medical help, he will die soon. The team calls Capt. Samantha Carter's father, Jacob, host of the Tok'ra Selmak, to help them. He brings a laser device that can make the Reetou visible and destroy them. But it might be too late to stop the assault: Thousands of Reetou are swarming outside the wormhole, and an unknown number may have already gained entry into Stargate Command.... (Metro-Goldwyn-Mayer (MGM))