In 1985, when the polarization between the United States and the Soviet Union became increasingly fierce, Stallone directed and starred in the Rocky series also released its fourth episode. This series of films aimed to inspire people and promote the American spirit. This episode tells the story of Rocky (Sylvester Stallone)'s friend, the former American boxing champion, who goes to the Soviet Union to fight against the boxing robot they developed. They lose to their opponent and eventually suffer an accident. In order to help his friend avenge his revenge and safeguard the honor of the country, Loki decided to take action again. Before going into the game, Rocky carried out a series of careful preparations. He went deep into nature and used the difficult conditions of nature to train hard. When everything was ready, the duel between Rocky and the Soviet boxing champion, the boxing robot, began!