Daniel "Rudy" Ruettiger grows up in a working-class family in Joliet, Illinois, dreaming of playing football for the University of Notre Dame, despite lacking the grades, the physical prowess, and the financial means to attend the prestigious institution. Undeterred by these obstacles, Rudy nurtures his dream, idolizing the Fighting Irish football team and drawing inspiration from their storied legacy. After high school, Rudy takes a job at the local steel mill, like his father and brother before him. However, the tragic death of his best friend in an accident at the mill galvanizes Rudy to pursue his dream before it's too late. With nothing but determination, Rudy finally earns admission to a nearby junior college, Holy Cross, endeavoring to improve his academic standing which could allow him to transfer to Notre Dame.

Rudy's relentless efforts to earn good grades and his unwavering commitment eventually yield success, and he is admitted to Notre Dame. Once on campus, he faces fresh challenges, including earning a spot on the football team as a walk-on. Overshadowed by the talented scholarship athletes, Rudy must work harder than he ever has, with each practice a grueling testament to his resolve. His spirited dedication wins him the respect of his teammates and the attention of the coaching staff, making Rudy a beloved figure in the locker room. Despite the physical toll and the skepticism of others, Rudy remains focused on his goal to dress for one game and take the field for the Fighting Irish.