Later on, the narrator is flying home from a trip. While flying home, he meets Tyler Durden. They become friends, and the narrator later calls him to meet at a bar after returning home to find his house destroyed. At the bar, Durden invites the narrator to stay with him. The pair get into a physical fight outside the bar before leaving for Durden's house. A crowd of men was drawn to the fighting, and Tyler, the narrator, and the men move the fighting into the basement of the bar and form their fight club.
Due to the club's popularity, more are created throughout America. They also form the organization Project Mayhem, which Durden leads. When an operation goes wrong, one of their members is killed. The narrator unsuccessfully tries to put an end to Project Mayhem. Tyler has disappeared by this point, and the narrator tries to find him. Once he gets to a hotel, a member of the organization addresses him as Tyler. When he gets to his hotel room, he finds Tyler. Tyler explains that they are split personalities, and that Tyler controls the body of the narrator when he sleeps.
The narrator discovers Tyler's plan to destroy buildings containing records of credit card companies. He rushes to targeted building, only to have Tyler hold him at gunpoint. The narrator realizes that he is actually holding the gun since they share the same body. The narrator is finally able to stop projecting Tyler, and escapes the building with a kidnapped Marla Singer.