Stargate SG-1: Season 2, Episode 20

2 - 20: Show and Tell

A young boy 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 announces that the Goa'uld destroyed his planet Reetalia and now Reetou rebels intend to kill all human beings to prevent possible future hosts.