Mother, leader of the Angels, a Los Angeles motorcycle gang, is hospitalized after being beaten up by members of the Hotdoggers, a rival Las Vegas gang. Upon his release, he leads the Angels to Las Vegas on a mission of vengeance. After a spree on Fremont Street, they pursue their enemies to their mine hideout. The trip through the desert takes its toll as hunger, thirst, and empty gasoline tanks dampen the group's spirits. Mother's girl friend defies him when he decides to leave behind a disabled motorcycle, and Mother tries but fails to persuade his fellow Angels to rape her as punishment. Leaving him behind, the gang goes on to complete its mission. Mother finds his way back through the desert, rejoining his gang for the final battle.