A Last Time for Everything.By the time the episode starts, Goodchild has perfected a method of copying humans. Determined to put an end to the operation, Æon and a fellow agent Scaphandra, who is a double-agent for Bregna and lost parts of her feet on a crossing and had a hand-transplant to replace what had been lost, cross the border into Bregna. As Æon rushes towards Trevor's base of operations, Scaphandra is captured and taken to Goodchild, who takes a sample of her for copying. Æon comes in, frees Scaphandra and tackles Trevor about the ethics and inner purposes of his operation. Deliberately presenting an opportunity for Trevor, Æon allows him to take a sample of her, though Æon smashes Scaphandra's sample. After Æon leaves, Trevor copies Æon for himself. It is revealed to be a complex plot by Æon to inflict maximum pain on Goodchild by exchanging places with her Copy, toying with Trevor's feelings, then allowing her Copy to kill her. But as she performs her half of the mission, the real Æon begins to lose herself, developing feelings for Trevor and vice versa. But, while she is still herself, she orders her Copy to kill Scaphandra. The Copy carries out her twin's request, pretending to cross the border with Scaphandra and hanging back, allowing the turrets to cut down her treacherous partner. It is then that the real Æon, who now looks and dresses very differently from her old self, comes and confronts the Copy. The two Æons, reluctantly, go to perform the border run and Trevor, not wanting the Æon he has come to love to die, orders the turrets to be deactivated. The two Æons do part of the run, then, as Trevor watches in horror, the real Æon stops and allows the turrets to shoot her, just before they are shut down. The episode ends with Trevor cradling Æon's body, shedding tears, while the Copy escapes back into Monica.