What actors and actresses appeared in La ciudad perdida - 1950?

You are likely thinking of the 1951 film "The Lost City" (La Ciudad Perdida) which is a Mexican adventure film. The main cast included:

* Pedro Infante as "Pedro Vargas"

* Marga López as "Aurora"

* Antonio Aguilar as "Don Rodrigo"

* Blanca Estela Pavón as "Elena"

* José Baviera as "El Capitán"

* Miguel Ángel Ferriz as "El Coronel"

* Carlos López Moctezuma as "Don Rafael"

* Wolf Ruvinskis as "Dr. Hugo"

This film was a big success in Mexico and helped to launch the careers of Infante and Aguilar.