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Cantinflas as Salvador Medina / Chava |
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Marta Romero as Laura Villanueva |
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Miguel Ángel Álvarez as Dr. Miguel Villanueva |
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Prudencia Grifell as Señora Martínez |
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Wolf Ruvinskis as Papá de Beto |
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Guillermo Zetina as Dr. Marín |
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Tony Carbajal as Dr. Pablo Montero |
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Pepito Velázquez as Beto |
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Carlos Riquelme as Administrador del hospital |
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Rosa Elena Durgel as Mamá de Beto |
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Alberto Catalá as Paciente ambidextro |
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Consuelo Monteagudo as Suegra de neurótica |
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José Chávez as Isidro Martínez |
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Paz Villegas as Paciente viejita coqueta |
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Ada Carrasco as Doña Lola |
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Arturo Castro 'Bigotón' as Comisario del pueblo |
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Guillermo Bravo Sosa as Paciente malnutrido (uncredited) |
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Margarita Delgado as Enfermera (uncredited) |
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Pedro Elviro as Paciente con television (uncredited) |
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Carmelita González as Paciente neurótica (uncredited) |
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Ramón Valdés as Paciente vendado (uncredited) |
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Alejandro Suárez as Hippie en cantina (uncredited) |
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Alfonso Zayas as Hippie en cantina (uncredited) |
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Jorge Zamora as Hombre en cantina (uncredited) |
| Directing | Miguel M. Delgado | Director |
| Camera | Rosalío Solano | Director of Photography |
| Writing | Fernando Galiana | Writer |
| Writing | Miguel M. Delgado | Screenplay |
| Crew | Carlos León | Additional Writing |
| Production | Jacques Gelman | Producer |
| Sound | Raúl Lavista | Original Music Composer |
| Editing | Jorge Bustos | Editor |
| Art | Manuel Fontanals | Production Design |
| Costume & Make-Up | Bertha Chiu | Hairstylist |
| Costume & Make-Up | Ana Guerrero | Makeup Artist |
| Production | Fidel Pizarro | Production Manager |
| Directing | Américo Fernández | Assistant Director |
| Sound | James L. Fields | Sound |
| Sound | Gonzalo Gavira | Sound Effects |
| Crew | Javier Mateos | Sound Recordist |
| Sound | Raúl Portillo | Sound Editor |
| Sound | Galdino R. Samperio | Sound Re-Recording Mixer |
| Directing | Luis Gaytán | Script Supervisor |
| Crew | Constanza Hool | Choreographer |
