On a routine visit to the new Athosian planet, Dr. Keller and Teyla discover that Teyla's people have vanished, leaving behind signs of a struggle. Moments later, the women must hide as two primitive warriors appear. Teyla's blood runs cold: the men are members of the Bola Kai, a tribe of sadistic killers. Dozens of them are prowling the woods.
Teyla and Keller hurry back toward the stargate, but Keller sprains her ankle on the way and they find the 'gate guarded by more warriors. Teyla urges Keller - who is in pain, out of her element and scared - to be strong. They must survive until the next day, when Atlantis will check in through the 'gate and learn that they need help. Suddenly, drums rumble through the forest. The Bola Kai have discovered that the women are here, and they mobilize to hunt the duo down.
Teyla is troubled by evidence that her people didn't use their advanced weapons against the primitive arrows and clubs of the Bola Kai, but there's no time to speculate about the mystery; she and Keller must keep moving. When Keller balks at crossing a treacherous rope bridge across a deep canyon, Teyla loses patience with the doctor's nervousness. Seeing Teyla's frustration, Keller grits her teeth and crosses the bridge with Teyla's help. On the other side, three Bola Kai warriors corner them, but Teyla kills them with blazing ferocity.
Nearby, they find a semi-conscious man, bound and bleeding - presumably a prisoner of the Bola Kai. As night falls, Teyla makes camp and, under Keller's care, the man awakens. He introduces himself as Nabel Golan, a Genii who was spying on the Athosians. He claims that the Bola Kai are Wraith-worshippers who summoned their predatory masters to this planet. The Athosians have been culled.
Teyla swallows her grief and stays focused. In the morning, as Bola Kai warriors close in on their position, she leads her two injured comrades deeper into the forest. Soon, a posse of Bola Kai surrounds them. Nabel hides as Teyla and Keller are captured and harshly interrogated by the Bola Kai leader, Omal. The warrior reveals that his people are not Wraith-worshippers. The settlement was destroyed before the Bola Kai arrived.
Before Teyla and Keller can discover what really happened to the Athosians, Nabel attacks their guards and frees them. Then, suddenly, he knocks Teyla unconscious. Aiming a gun at Keller, he demands to know the location of Atlantis. He isn't Genii - and even if Keller can find the courage to resist him until help arrives, his true identity, and the true fate of Teyla's people, will remain maddeningly unclear â�¦ for now.