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 | Federico G. Larraya | Director of Photography |
| Editing | José Antonio Rojo | Editor |
| Art | Enrique Alarcón | Production Design |
| Costume & Make-Up | Ricardo Vázquez | Makeup Artist |
| Production | Pablo Tallaví | Production Manager |
| Directing | Pio García Viñolas | Assistant Director |
| Art | Mariano de Lope | Property Master |
| Sound | Jaime Torrens | Sound Director |
| Camera | Ricardo Navarrete | Camera Operator |
| Camera | Antonio Ortas | Still Photographer |
| Camera | Raúl Pérez Cubero | Assistant Camera |
| Directing | María de las Mercedes Otero | Script Supervisor |
| Production | Ramón Baillo | Production Assistant |
| 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 |
