Directed by
| Mischa Muller | ... | (as Mischa Müller-Thyssen Bergareche) |
Writing Credits (in alphabetical order)
| Jesús M. Balmaseda | ... | (story) |
| Isa Moreno | ... | (co-writer) |
| Mischa Muller | ... | (co-writer) (as Mischa Müller) |
| Tomás Onaindia | ... | (co-writer) |
Cast (in credits order)
| Paul Naschy | ... | Entrenador de boxeo | |
 |
Juan y Medio | ... | Boxeador joven |
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|
Domingo Beltrán | ||
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|
Francisco Morales | ||
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|
Teodoro Milan | ||
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|
Pepe Carmona | ||
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Antonio Abad | ||
| Rocío Alzueta | |||
Produced by
| Jose María Martínez | ... | producer |
Cinematography by
| Carlos de Paz | ||
Editing by
| Leixandre Froufe | ... | (edited by) |