After the thrilling fight that pushed him to his limits, Italian-American boxer Rocky Balboa finds himself dealing with the aftermath of his epic confrontation against Apollo Creed. Although his heart still beats strongly for boxing, life presents him with new challenges. Married to Adrian, Rocky must confront the harsh realities of daily life, including debts and the pressure to provide for his family. Adrian, who has always been his rock, is recovering from a serious complication after the birth of their son, adding more uncertainty to Rocky's life.
Meanwhile, the defeat continues to weigh heavily on Apollo, who cannot bear the thought of being considered a "halfway" champion. This creates a strong desire for revenge, leading him to challenge Rocky to a new fight. Although he initially hesitates due to his current life and family responsibilities, the passion for boxing and pride as an athlete awaken within Rocky.
With Adrian's support, who finally gives him the emotional push he desperately needs, Rocky decides to train and prepare for the fight that could define both his career and his life. A training regimen that combines his iconic lifestyle with fierce determination leads him to face Apollo in a spectacular setting. The movie culminates in an intense fight that tests not only his skills in the ring but also his character and resilience.