Set during the Great Depression, the story centers on James J. Braddock, a once-promising light heavyweight boxer forced into retirement after a string of defeats. As the economic downturn takes its toll, Braddock struggles to support his wife, Mae, and their children, facing a bleak and uncertain future. Despite the hardships, his love for his family and Mae's unwavering support keep the spirits of the household afloat. Braddock is forced to take on manual labor at the docks, which, while grueling, strengthens his once-injured hand and reignites his fighting spirit.

An unexpected turn of events gives Braddock a second chance at boxing when his former manager, Joe Gould, secures him a last-minute fight with a rising contender. Seen as nothing more than a novelty and an easy win for his opponent, Braddock's return to the ring is met with skepticism. However, his grit, determination, and improved technique take the boxing world by surprise. Embarking on an improbable comeback, he becomes a symbol of hope for the downtrodden masses, earning the nickname "Cinderella Man." As he continues to win against all odds, Braddock's journey becomes about more than just fighting for titles; it's a fight for dignity, family, and the American dream.