A ticking-time-bomb insomniac (Edward Norton) and a slippery soap salesman (Brad Pitt) channel primal male aggression into a shocking new form of therapy. Together they create a new "fight club" where young men come to relieve their frustrations by beating each other to a pulp. Their concept catches on, with underground "fight clubs" forming in every town, until a sensuous eccentric (Helena Bonham Carter) gets in the way and ignites an out-of control spiral toward oblivion.