The brave Rambo (Sylvester Stallone) is back! This time, Rambo was ordered to return to Vietnam to investigate whether the missing American soldiers had become prisoners of war. However, as soon as Rambo landed in Vietnam, all his equipment and weapons were lost! All he had left was a saber and a set of military bows and arrows. Rambo, who was in adversity, accidentally discovered that it was his own troops who betrayed him! Rambo was helped by a local Vietnamese girl when he was on the verge of death. With the help of the girl, Rambo overcame all difficulties with his superb survival skills and strong will, and finally escaped. Rambo decided to strike hard at the person who betrayed him!