In a bustling American city of the 1930s, a young and talented boxer named Tommy carves his path in a world full of adversities. He has always been a boy with big dreams, but his life takes an unexpected turn when he becomes a crowd favorite, known as "The Nipper" for his agility and incredible speed in the ring. With his contagious energy and indomitable spirit, Tommy seeks not only personal success but also his father's approval, an ex-boxer whose expectations are as high as the mountains.