A tough trucker with a cheeky pet orangutan, Philo Beddoe (Clint Eastwood) moonlights as a fighter, with his close friend Orville Boggs (Geoffrey Lewis) setting up matches for him. When Philo begins dating country singer Lynn Halsey-Taylor (Sondra Locke), and she abruptly disappears, he goes off in search of her, his simian companion and Orville in tow. On their cross-country trek, Philo and friends repeatedly clash with bikers, leading up to a violent showdown.