Together with The Narrator, the protagonist of the film, they organize an underground fighting club for men. Tyler later turns this into a terrorist organization under the name ‘Project Mayhem’.
In an unexpected plot twist at the end of the film, it is revealed that The Narrator and Tyler Durden are one and the same, the latter being a subconscious projection of the former’s imagination.
Tyler Durden has an important role as the antihero of Fight Club. He is also an important element in the development of the film’s narrative and other characters, such as Marla Singer or Bob, a testicular cancer survivor.