S2, E20: A young boy (Jeff Gulka) gains entry to the SGC and tells the SG-1 team 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 planet Reetalia and now Reetous rebels intend to kill all human beings. The rebels believe that by killing all potential hosts for the Goa'uld they will gradually eliminate the the Goa'uld themselves. His mother created Charlie to serve ans an intermediary between the Reetou and humans and to warn them of the coming rebel attack but due to his accelerated growth the boy's organs are now failing and unless he receives expert medical help he will die soon. The SG-1 team call Carter's father Jacob (Carmen Argenziano) a Tok'ra to help them. He brings a laser device which can make the Reetou visible and destroy them. But it may be too late. Thousands of Reetou are swarming outside the wormhole and an unknown number may have already gained entry into the SGC.