Dedicated, saintly nurse has a twin sister who is a Bad Girl.
| Actor | Role |
|---|---|
 Ana Luisa PeluffoLaura Moreno / Vicky | Laura Moreno / Vicky |
 Carlos CoresDr. Enrique Molina | Dr. Enrique Molina |
 Rubén RojoMartín | Martín |
 Fanny SchillerLa Mariposa | La Mariposa |
 Francisco JambrinaDr. Andrade | Dr. Andrade |
| CConsuelo MonteagudoSrita. Ocampo | Srita. Ocampo |
 Manuel ArvideInsp. Jiménez | Insp. Jiménez |
 Enrique García ÁlvarezDirector de sanatorio | Director de sanatorio |
 José MuñozPolicía | Policía |
 José ChávezFerrocarrilero asesinado (uncredited) | Ferrocarrilero asesinado (uncredited) |
| GGuillermo HernándezMesero | Mesero |
| CCecilia LegerTaquillera | Taquillera |
 Inés MurilloPaciente de doctor | Paciente de doctor |
 Beatriz RamosRecepcionista en sanatorio | Recepcionista en sanatorio |
| JJoaquín RocheDon Carlitos | Don Carlitos |
| RRicardo Sánchez de la BarqueraMiguel Ángel | Miguel Ángel |