By chance, Miguel el Tarta becomes a potential boxing champion. Manipulated by Manolo, his opportunistic and cynical best friend, and several unscrupulous individuals, Miguel is thrown into the ring, where he tries to fight with more enthusiasm than technique.
| Directing | Pedro Luis Ramírez | Director |
| Camera | Raúl Pérez Cubero | Assistant Camera |
| Directing | María de las Mercedes Otero | Script Supervisor |
| Costume & Make-Up | Ricardo Vázquez | Makeup Artist |
| Directing | Pio García Viñolas | Assistant Director |
| Camera | Ricardo Navarrete | Camera Operator |
| Art | Enrique Alarcón | Production Design |
| Art | Mariano de Lope | Property Master |
| Camera | Federico G. Larraya | Director of Photography |
| Editing | José Antonio Rojo | Editor |
| Production | Pablo Tallaví | Production Manager |
| Production | Ramón Baillo | Production Assistant |
| Camera | Antonio Ortas | Still Photographer |
| Sound | Jaime Torrens | Sound Director |
| Writing | Vicente Coello | Screenplay |
| Writing | Vicente Escrivá | Screenplay |
| Sound | Federico Contreras | Original Music Composer |
| Production | José Antonio Pérez Giner | Production Director |
| Sound | Antonio Alonso | Sound Engineer |
