A group of juvenile delinquents live a violent life in the infamous slums of Mexico City; among them Pedro, whose morality is gradually corrupted and destroyed by the others.
| Directing | Luis Buñuel | Director |
| Writing | Luis Buñuel | Screenplay |
| Writing | Luis Alcoriza | Screenplay |
| Production | Óscar Dancigers | Producer |
| Sound | Gustavo Pittaluga | Original Music Composer |
| Camera | Gabriel Figueroa | Director of Photography |
| Editing | Carlos Savage | Editor |
| Art | Edward Fitzgerald | Production Design |
| Production | Federico Amérigo | Production Manager |
| Directing | Ignacio Villareal | Assistant Director |
| Production | Fidel Pizarro | Production Director |
| Production | Antonio de Salazar | Administration |
| Sound | Rodolfo Halffter | Music Arranger |
| Sound | Rodolfo Halffter | Music Director |
| Editing | Alberto Valenzuela | Assistant Editor |
| Sound | Jesús González Gancy | Sound Director |
| Sound | José B. Carles | Sound Recordist |
