A man from humble origins becomes a famous boxer, but fame has its price.
| Actor | Role |
|---|---|
 María Esther BuschiazzoMadre de Carlos | Madre de Carlos |
 Patricia CastellRosita | Rosita |
| CCarlos D'AgostinoVoz en off | Voz en off |
 Delfy de OrtegaNelly | Nelly |
| RRicardo DugganRaúl / K. O. Cardón | Raúl / K. O. Cardón |
 María Rosa GalloElisa | Elisa |
 Oscar ValicelliArmando | Armando |
| RRaúl del ValleMéndez | Méndez |
 José NájeraRaúl | Raúl |
 Rafael IglesiasÉl mismo | Él mismo |
 Oscar VillaFerreyra | Ferreyra |
| GGilberto PeyretEl Flaco | El Flaco |
| DDomingo SciaraffoaÑato | Ñato |
| AArsenio PerdigueroDon Ramón | Don Ramón |
 Roberto BlancoRobles | Robles |
| MMario CozzaNot listed | Not listed |
| DDiego MarcoteSecuaz de Armando | Secuaz de Armando |
| DDomingo CucciNot listed | Not listed |
| AArnoldo ParesNot listed | Not listed |
| MMauro CíaNot listed | Not listed |
| NNéstor CoriaNot listed | Not listed |
| JJusto AlcarazNot listed | Not listed |
| UUrbano RodríguezNot listed | Not listed |
| JJuan Carlos CerruttiNot listed | Not listed |
| AAlfonso AraujoNot listed | Not listed |
| SSimón BronemberNot listed | Not listed |