Although animosity towards Rush, who hid his recent breakthrough in cracking Destiny's main code, is fierce, the crew is happy to have mastered the ability to manually drop the ship out of FTL. When they do, they discover three planets within dialing range. But the spirit of exploration is marred by the discovery that Simeon is missing after a double murder: The consciousness Amanda Perry in the body of Ginn, a move that ended both lives. In one stroke, Eli and Rush have both lost the women they love, and the taste for revenge is thick on their tongues.
Simeon acts quickly, taking Park hostage and pulling her through the gate onto a nearby desert planet. Rush discovers his trail and follows - he is able to save Park, who was strapped by Simeon to a bomb, but the assailant is nowhere to be seen. As the military personnel proceed through the gate to attempt to recover him, they realize how dangerous the Lucian soldier is, and how precarious their own position.
Eli, having been ordered to stay on Destiny in an attempt to stall the countdown clock and give the away team more time, is bucking to hunt down Simeon, but Young grounds him: Before her death, Ginn told homeworld command that Simeon had information on the planned Lucian attack on Earth, and they need Simeon alive in order to save their home planet. Eli masters his emotions and returns to work, but soon Young, having discovered a remarkable ability in Chloe - she now understands more about the ship than anyone could've hoped for - directs her to the bridge and instructs the scientists to let her help. In a state of semi-consciousness, Chloe begins pushing buttons. Eli, panicking, restrains her, and he and his team usher her away and scramble to learn what damage she may have caused.
Rush's head is not as cool as Eli's - he is hotly pursuing Simeon by using his stargate remote to track the one that Simeon has. He is flanked by Scott and Greer, who are attempting to temper his rage in hopes of bringing back Simeon alive and gleaning information from him. But Rush wriggles out from under their surveillance when Greer is shot and Scott must bring him back to the gate for medical attention. Rush gets close enough to Simeon to engage, and takes several clear shots at the Lucian with a paltry firearm. But an explosion in the distance soon alerts Simeon to Rush's real purpose: The alien planet's native grazers - buffalo-like creatures - are spooked by the explosion and stampede towards Simeon, crushing him like a flower. Rush approaches the crippled man, who utters a plea for his life by saying that he has information - but Rush is blind to the logic that saving this man's life could save hundreds of thousands of lives on Earth. He draws his gun and shoots Simeon.
Avenged, Rush stumbles back to the gate, where Scott tells Rush that he knows, from Eli's surveillance methods, that Rush found and killed Simeon. With a valediction to the information lost with the enemy's life, Scott asks Rush if the murder has quelled his feelings of grief. It is clear, from Rush's turbulent silence, that it has not.