 On a mission to observe a nebula, SG-1 finds a crashed ship and its three human survivors. They soon come under fire from an pair of aliens bearing the weapons of the survivors. They repel the attack, but one of the three is wounded. She is taken to the SGC for treatment while Sam attempts to repair the ship. Jack and Teal c feel that there is more to the relationship between the aliens and these humans, and attempt to trap an alien.