In Hong Kong, a haunting nightmare plunges Lee Hoi-chuen, Bruce Lee's father, into a realm of fear as he dreams of a phantom, known ominously as the Demon, stalking his young son. This wakeful terror leads him to enroll Bruce in Chinese martial arts training under the guidance of the esteemed instructor Yip Man. As Bruce matures into a young adult, he bravely confronts a group of British sailors who are imposing themselves on a Chinese woman, ultimately forcing him to make the heart-wrenching decision to flee Hong Kong. His father insists he seek refuge in the United States.
Upon arrival in the US, Bruce takes a job as a dishwasher in a Chinese restaurant, where he soon finds himself embroiled in a brawl with four of the cooks. While the restaurant owner, Gussie Yang, lets him go, she provides him with a loan to pursue higher education. During his college years, Bruce dives into philosophy and begins teaching martial arts classes, where he encounters Linda, an American woman of white descent. Defying her racist mother, Vivian, Bruce marries Linda, who later proposes the idea of opening a martial arts school. However, his Chinese colleagues insist that he must restrict his teachings to only those of Chinese descent. In a fiery confrontation, Bruce accepts their challenge and emerges victorious against a challenger named Johnny Sun in a brutal, no-holds-barred fight. Unfortunately, after his admission of defeat, Johnny strikes again, leaving Bruce with a severe back injury that causes temporary paralysis. In this dark period, Linda supports him in penning his martial arts book, Tao of Jeet Kune Do. The couple later welcomes their son, Brandon, reconciling with Linda's mother in the process.
Months pass, and during a martial arts tournament hosted by Ed Parker, Johnny provokes Bruce for a rematch. With both skill and determination, Bruce conquers him and gains the admiration of the audience, unaware that Johnny has become incapacitated due to the fight. The aftermath brings Bill Krieger into Bruce's life, who offers him the role of Kato in the series The Green Hornet. Together, they brainstorm the television series Kung Fu, where Bruce is originally slated to star. However, when Kung Fu debuts featuring white actor David Carradine, Bruce feels betrayed.
Returning to Hong Kong for his father's funeral, Bruce is hired by film producer Philip Tan to lead in The Big Boss. During the film's climactic scene, he faces vengeance from Johnny's brother, Luke, but Bruce prevails. The success of The Big Boss propels Bruce to continued fame as an actor, director, writer, and editor, igniting tensions in his marriage as Linda yearns to return to the States. When Krieger presents Bruce with an opportunity in a Hollywood blockbuster, he agrees, hoping to please Linda.
On the 32nd day of filming Enter the Dragon, while performing the iconic "room of mirrors" sequence, Bruce experiences a vivid and terrifying vision of the Demon looming over him. This time, the specter embodies a grave threat to his son, manifested in the haunting plea from Brandon for salvation. Faced with this chilling reminder of his father's dark past, Bruce fights back fiercely, ultimately breaking the Demon's neck using a pair of Nunchaku. This pivotal moment transitions into the filming of Enter the Dragon, a project poised to cement Bruce's status as a global icon. In a heart-wrenching voice-over, Linda reflects on Bruce's untimely passing shortly before the movie's release, conveying her wish to honor his vibrant life rather than focus on the tragedy of his death.
