Singer-turned-boxer Andy 'Kid' Clave signs a contract with a shady promoter Joaquin Vargas. 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.
| Actor | Role |
|---|---|
 Willie ColónJoaquin Vargas | Joaquin Vargas |
 Rubén BladesAndy "Kid" Clave | Andy "Kid" Clave |
 Fred WilliamsonJesse Crowder | Jesse Crowder |
 Darlanne FluegelSally | Sally |
 Tony SiricoFrankie | Frankie |
 Joe SpinellAngelo | Angelo |
| NNereida MercadoNancy | Nancy |
| VVinny ArgiroDetective Pantano | Detective Pantano |
 Sal CarolloPapa | Papa |
| AAndy GeradoFrank | Frank |
| IIzzy SanabriaSlim | Slim |
 Alex StevensSal | Sal |
 Kurt AndonDoctor | Doctor |
| MMarta VianaMama | Mama |
| DDarlene MasucciPretty Girl at Party | Pretty Girl at Party |
| TTed ThurstonDiner Owner | Diner Owner |
 Adrianne SachsJesse's Girlfriend | Jesse's Girlfriend |
| SStan GoldsteinCar Window Washer | Car Window Washer |
| FFrankie MoiaCasino Pit Boss | Casino Pit Boss |
| JJosé TorresEx-Champ | Ex-Champ |
 Don KingSelf | Self |
 Salvador SánchezSelf | Self |
 Celia CruzSelf | Self |
| JJohnny PachecoSelf | Self |
| HHéctor LavoeSelf | Self |
 Tony PerezThe Referee | The Referee |
| BBurt SugarmanSelf | Self |
 Don DunphyRadio Fight Announcer | Radio Fight Announcer |
| MManuel SebastianMaitre'D | Maitre'D |
| TTony PageCasino Manager | Casino Manager |