Cantinflas

as Salvador Medina / Chava

Marta Romero

as Laura Villanueva

Miguel Ángel Álvarez

as Dr. Miguel Villanueva

Prudencia Grifell

as Señora Martínez

Wolf Ruvinskis

as Papá de Beto

Guillermo Zetina

as Dr. Marín

Tony Carbajal

as Dr. Pablo Montero

Pepito Velázquez

as Beto