Singer-turned-boxer Andy 'Kid' Clave (Ruben Blades) signs a contract with a shady promoter Joaquin Vargas (Willie Colon). But Clave turns against Vargas when the promoter's thugs kill Clave's girlfriend when he thinks about backing out of the contract. While seeking a way to get revenge against Vargas, Clave learns that he has a blood clot in his head. But nothing will deter him from getting his revenge and making a shot at the title.