A high-particle locator beam emanates from Stonehenge, alerting Renee Palmer (Jayne Heitmeyer) and J Street (Melinda Deines) to an Atavus hive. Flying by ID shuttle to the site, they find two pods, one that was apparently breached by a 16th century knight, killing the Atavus inside, and the other containing the deceased Atavus' mate. Acting quickly for fear that Ronald Sandoval (Von Flores) has also learned the location of the hive, Renee decides to test Street's theory that extreme cold can kill the Atavus invaders. She sets up a portal to transport them and the unopened pod to the Southstar Geophysics Labs in Antarctica.

At the Antarctic station, Renee and Street encounter Pax (Derek McGrath), the facility's maintenance manager. Holding Pax at gunpoint, they order him to bring the lab annex up to full power and provide them with a canister of liquid nitrogen and a portable pump generator. The two women use the supplies to set up a huge tank in which they place the pod. The pod opens to reveal a handsome Atavus named Gren (Anthony Lemke), and the women quickly lower the temperature inside the tank to subdue their captive.

Renee contacts the FBI's acting director, Ryan Patricio (Noam Jenkins), informing him that she has captured a live Atavus, finally having irrefutable proof of the aliens' existence. She demands he supply her with a biotech team for verification and autopsy, an FBI agent for security and a media crew. Renee is transporting the team by portal when the station's power system falters just long enough for Gren to escape the tank. He grabs Street, but is held at bay by Renee, armed with a freeze-drying weapon developed by Street. Gren insists he is not a killer like the other Atavus they have encountered. Taking no chances, Renee forces him back into the tank.

Street begins to feel sympathetic toward Gren, and develops a powerful attraction for him. When Gren again escapes from the tank, Renee and the team open fire, wounding him, but he still manages to flee. Meanwhile, onboard the Taelon Mothership, Sandoval is able to trace Renee, Street and Gren to the Antarctic station, and Howlyn (Alan Van Sprang) immediately orders him to apprehend Gren and Renee, and to kill the others.

When Street finds the wounded Gren, he promises to help end Howlyn's murderous rampage if she helps him escape. Unable to fight her attraction for him, she kisses him and helps him to a portal. After finding Pax's body, Renee and her team are ambushed by Sandoval and his men, who open fire. Renee is able to escape, but the others are killed.

Returning to Augur's lair, Renee receives a communication from Street, who is at the Flat Planet nightclub with Gren. While Renee informs Street that Gren killed Pax, Gren slips across to a quiet corner of the club, where he kills a female patron. He returns to the now terrified Street and forces her to portal them to Stonehenge.

Arriving at Stonehenge, Gren lowers Street into the sinkhole to look for the crystal beacon that transmitted the high-particle beam that first brought Street and Renee to the hive. Street finds the crystal but refuses to give it to him. As he raises his cleave to kill her, Renee suddenly appears from behind him. Hoisting the long-abandoned sword of the medieval knight, she decapitates him. Street keeps the crystal, hoping that she may be able to eventually decipher its light patterns to determine the location of other Atavus hives.

This episode synopsis was originally produced by The Official E:FC Website and remains the property of Tribune Entertainment.