Born with a congenital birth defect that left him with only one arm, Nick Newell grew up being bullied and tormented by his peers. Fed up with his situation, he decides to join the high school wrestling team in hopes of changing his fate. While the numerous initial losses are heartbreaking, he never gives up and instead, powers through every obstacle to master the art of fighting. One day, his best friend Abi convinces him to sign up for MMA in order to financially help his single mother.