Veteran Rambo (Sylvester Stallone) returns from Vietnam. He returns to his hometown, which has become unfamiliar. The local sheriff (Brian Dennehy) starts to find fault with Rambo from the moment he sees the veteran. He even takes him back to the police station and insults him. Unable to bear the beating, Rambo attacks the police and runs away. The sheriff summons a large number of police officers to hunt down Rambo. Rambo flees to the wilderness and constantly fights back against the police with the guerrilla tactics he mastered in the Vietnam War. He robs an arms transport truck and returns to town to burn down the store. Neither the law nor weapons can stop Rambo. Rambo's superior during the Vietnam War, Colonel (Richard Crenna), appears and persuades Rambo to lay down his gun. Rambo, who has been angry for a long time, roars out his confusion and unwillingness...