Topic summary
Tyler Durden

Extracted from the Wikipedia article The Narrator (Fight Club).
Fight Club 2 (2015)
Fight Club 2 provides a new, drastically different explanation for Tyler: the Narrator discovers that Tyler is not merely his own alter, but essentially, a sort of meme who can spread from one person to another. The current host of the "Tyler Durden" personality damages the life of a younger child with the express purpose of causing the stress factors that will give rise to a new "Tyler Durden" personality in them when they grow up, thus allowing "Tyler Durden" to achieve a sort of functional immortality. The Narrator's therapist has pieced this together through hypnosis sessions, explaining to him that the Narrator's own father and grandfather were hosts, and that "Tyler" was involved in shaping Marla's life as well—"breeding them like cattle" for generations, so the Narrator and Marla could in turn produce a son, who would be Tyler's host in the next generation. Junior only faked his death in the fire, as he is slowly being taken over by his Tyler Durden just as his father was. The Narrator has to race to stop "Tyler", even though he cannot truly kill him without killing both his son and himself.