Sean learns more about the bomb, but is unable to convince Pollux for the location. His friends suggest that there is only one way: To exchange his face for Castor’s own in order to infiltrate the prison where Pollux is and get the bombs location. Archer then undergoes face transplant surgery by Dr. Malcolm Walsh and is sent to the same prison where Pollux is. The procedure is only kept a secret to Archer, his two FBI colleagues, and Dr. Walsh.
Soon after, Castor awakes from his coma and discovers his face missing. He calls in his gang and force Dr. Walsh to put Sean's face on him. Castor burns the lab with Walsh and Archer’s FBI colleagues inside, erasing all evidence of the switch. Castor visits the prison and taunts Archer about what happened. Castor, as Sean, releases Pollux and forces him to reveal the bomb’s location. Disarming the bomb in a dramatic fasion, Castor gains the trust of Archer’s FBI colleagues. Castor also gets close to Archers family: He romances Sean’s wife, Eve, and saves Sean’s daughter, Jaime, from an attempted rapist.
Later, Castor learns that Archer has escaped from prison and has retreated to his headquarters. Castor, as Sean, attacks the headquarters. He confronts Archer, who later kills Pollux. The next day, Castor kills FBI Director Victor Lazarro. At Lazarro's funeral, Castor confronts Archer once again and takes Eve hostage. A gunfight later ensues and Castor takes Jaime hostage, but she retaliates by stabbing him with a knife he, ironically, gave her for self-defence. Castor kills two FBI agents and flees in a speedboat, but Archer pursues him and forces him into shore by collision. Archer then kills Castor with a spear gun and finally Archer gets his face back.
He is a terrorist-for-hire who plans to stage a bombing in Los Angeles with the help of his brother Pollux, with a price tag of $10 million. However, his plans are hindered when his rival Sean Archer knocks him into a coma and switches faces with him to thwart the bombing.
As his original self, he was portrayed by Nicolas Cage, who also played Mr. Brent Ryan in Mom and Dad, Peter Loew in Vampire's Kiss, Yuri Orlov in Lord of War, Speckles in G-Force, and Little Junior Brown in Kiss of Death. While masquerading as Sean Archer, he was portrayed by John Travolta, who also portrayed Vic Deakins in Broken Arrow, Billy Nolan in Carrie, Howard Saint in The Punisher, Vincent Vega in Pulp Fiction, Ryder in The Taking of Pelham 123, Gabriel Shear in Swordfish, Emil Kovač in Killing Season and Terl in Battlefield Earth.
Castor attempts to assassinate Archer at a carnival, but he accidentally kills Archer's five-year-old son, Michael. Consumed by revenge, Archer vows to bring Castor to justice.
Six years later, Castor and his younger brother/accomplice Pollux plan to threaten to blow up Los Angeles with a powerful bomb hidden in a secret location in order to get $10 million. As Castor and Pollux board a plane at a small airport, they are pursued by Archer and his FBI team. Archer shoots the planes engine, causing it to crash. Archer later corners Troy at a warehouse. Castor gloats to Archer about the bomb, but he is knocked into a coma before Archer can learn more, while Pollux is arrested.