The film delves into the historical and scientific evolution of baseball's most essential pitch—the fastball. Through a series of interviews with legendary players, scientists, and historians, the documentary captures the essence of the sport and its ties to American culture. The narrative examines key moments in baseball history, focusing on iconic fastballs thrown by pitchers like Nolan Ryan, Bob Feller, and Aroldis Chapman. Analysts deconstruct these pitches to understand their mechanics, exploring the physics behind how speed and precision are achieved. The film also reflects on how technological advancements over the decades have influenced the way pitchers train and develop their fastballs.

Parallel to the technical examination, emotional and anecdotal stories from players provide an intimate view of their personal experiences on the mound. Tales of triumph, rivalry, and dedication underline the human aspect of the sport. The documentary captures the pressure and exhilaration pitchers face when delivering that perfect fastball. Additionally, it showcases the evolving relationship between pitchers and hitters, emphasizing how mutual respect and competition have shaped their dynamics. Ultimately, the movie interweaves science and storytelling to offer a comprehensive look at one of baseball's most thrilling elements.