In 1998, young Adonis "Donnie" Johnson, portrayed by Michael B. Jordan, finds himself incarcerated in a Los Angeles youth facility. His life unexpectedly changes when Mary Anne Creed, played by Phylicia Rashad, the widow of former heavyweight champion Apollo Creed, visits him and offers him a chance to live with her.
Fast forward seventeen years, and Donnie makes a bold decision to leave his stable job at a securities firm to chase his dream of becoming a professional boxer. Mary Anne is fiercely against this plan, haunted by the tragic memory of her husband, who lost his life in the ring against Ivan Drago. Determined to prove himself, Donnie seeks entry into the prestigious Delphi Boxing Academy in Los Angeles, only to be turned away after being defeated by the gym's star boxer, Danny "Stuntman" Wheeler.
Not willing to give up, Donnie travels to Philadelphia, aiming to connect with his father's old friend and rival, the legendary Rocky Balboa, played by Sylvester Stallone. He locates Rocky at his Italian restaurant, Adrian's, named after his late wife. Initially hesitant to return to the sport due to past trauma, Rocky eventually agrees to train Donnie. With the help of Rocky's friends at the Front Street Gym, Donnie also discovers a romantic interest in Bianca, portrayed by Tessa Thompson, a promising singer and songwriter.
As his journey unfolds, Donnie earns the moniker "Hollywood Donnie" and scores an early victory against local fighter Leo "The Lion" Sporino. However, his emergence as Creed’s illegitimate son makes waves, prompting world light heavyweight champion "Pretty" Ricky Conlan to challenge him. Conlan, played by Tony Bellew, is looking for a final opponent before being forced into retirement. While Donnie initially hesitates, wanting to carve out his own identity, he ultimately accepts the challenge under the name Adonis "Hollywood Donnie" Creed.
Amidst training, Rocky receives the devastating news that he has non-Hodgkin's lymphoma. Struggling with memories of loss and his own mortality, Rocky grapples with the decision to undergo treatment, remembering Adrian's fate. Seeing Rocky in distress, Donnie encourages him to seek the help he needs.
In a gripping climax, Donnie faces Conlan in Liverpool, where echoes of Apollo and Rocky’s historic battles resonate. Donnie enters the ring adorned in new American flag trunks gifted by Mary Anne, reminiscent of those worn by his father. The fight is intense, and Donnie impressively goes the distance, losing by split decision but earning respect from the champion and the audience. As Jim Lampley states during the match, "Conlan won the fight, but Creed won the night," highlighting Donnie's hard-fought respect in the boxing world.
The film culminates with a symbolic moment where Donnie and a recovering Rocky ascend the "Rocky Steps" at the Philadelphia Museum of Art, marking a poignant new chapter in both their lives.
