Miguel M. Delgado Director, Screenwriter Mario Moreno 'Cantinflas' Salvador Medina , Chava Actor Marta Romero Laura Villanueva Actor Miguel Ángel Alvarez Dr. Miguel Villanueva Actor Prudencia Griffel Abuela de Isidro Actor Wolf Ruvinsky Papá de Beto Actor Guillermo Zetina Dr. Marín Actor Tony Carbajal Dr. Pablo Montero Actor Pepito Velázquez Beto Actor Rosalío Solano Cinematographer Raúl Lavista Original Music