"Dedicated, saintly nurse has a twin sister who is a Bad Girl."
Ana Luisa Peluffo
as Laura Moreno / Vicky
Carlos Cores
as Dr. Enrique Molina
Rubén Rojo
as Martín
Fanny Schiller
as La Mariposa
Francisco Jambrina
as Dr. Andrade
Consuelo Monteagudo
as Srita. Ocampo
Manuel Arvide
as Insp. Jiménez
Enrique García Álvarez
as Director de sanatorio
José Muñoz
as Policía
José Chávez
as Ferrocarrilero asesinado (uncredited)
Guillermo Hernández
as Mesero
Cecilia Leger
as Taquillera
Inés Murillo
as Paciente de doctor
Beatriz Ramos
as Recepcionista en sanatorio
Joaquín Roche
as Don Carlitos
Ricardo Sánchez de la Barquera
as Miguel Ángel
Alfonso Corona Blake
Director
Fernando Galiana
Writer
Eufemio Rivera
Assistant Editor
Armando Stahl
Special Effects
Pedro López
Script Supervisor
Sergio Magaña Hidalgo
Dialogue
Américo Fernández
Assistant Director
Óscar J. Brooks
Producer
Guillermo Castillo
Casting
Enrique L. Morfín
Production Supervisor
Screenplay
Luis Fernández
Sound Recordist
Manuel Esperón
Music
José Rodríguez Granada
Production Design
Roberto Camacho
Story
Luis García
Lighting Technician
María E. Salazar
Hairstylist
Urbano Vázquez
Camera Operator
Ernesto Enríquez
Jack Draper
Director of Photography
Rafael Ceballos
Editor
Dolores Camarillo
Makeup Artist
