"The Ties That Bind," and claims that, although he does not agree with Natalie and her followers, he will respect their wishes. The Number Twos, Number Sixes and Number Eights (except Boomer) demand the Threes be unboxed to end the deadlock. Cavil seemingly acquiesces but, in reality, sets a trap to destroy Natalie and her followers. Boomer starts to have second thoughts about going against her fellow Eights. However, Cavil, who has developed a relationship with her, encourages her to embrace her true nature as a machine, and abandon her emotions. Natalie survives the attack, and a civil war ensues. D'Anna is unboxed by Cavil in "The Hub". Cavil hopes she will be able to mediate peace between the warring Cylon factions, but she kills him and escapes with Helo and a Number Eight. In "No Exit", it is revealed Ellen Tigh was involved in the creation of Cavil, modelling him after the image of her own father, John. Cavil was the first of a new generation of Cylons, and he assisted in the creation of models Two to Eight. Because Ellen Tigh favored the Number Seven (Daniel) model, Cavil's jealousy grew and he had the entire line destroyed by tampering with the amniotic fluid housing the Daniel copies. Cavil was also responsible for the Final Five being banished to live as humans. His rage fueled in part by the Final Five condemning him to an existence complete with all of humanity's weaknesses, and realizing the Five would try to avert another war against the humans, he killed them and when they resurrected, he erased their memories and left them among the humans so they could witness the eventual genocide of the human race. Cavil manipulated his "parents", the Final Five, to be among those who suffered the most. It was also speculated (although never explicitly stated) Cavil was the one who programmed models Two to Eight not to seek out or discuss the Final Five. This theory has been confirmed in an interview with writer Ryan Mottesheard: After Ellen Tigh is poisoned by her husband, she resurrects aboard one of Cavil's ships and is held prisoner there for 18 months (No Exit). In the process of downloading to a new body, Ellen regains the memories Cavil had erased. Later, when the Cylons' resurrection capability is destroyed, Cavil attempts to acquire Ellen's knowledge of the technology (she and the other