In 1944, RKO Radio Pictures, Inc. entered into an equal partnership with a group headed by Mexican financier, Emilio Azcarraga, to construct a new motion picture studio complex, Churubusco Studios, in what was then a suburb of Mexico City. Churubusco functioned primarily as a rental facility for numerous independent production companies, but RKO also created a subsidiary company, Ramex, S.A., headed by producer José M. Noriega, to produced remakes, in Spanish, of properties owned by RKO. Los que volvieron (1948) (Those Who Returned) was the first of five to go into production. The films were released in the U.S. by Clasa-Mohme, Inc. In 1947, the Mexican partners bought out RKO's interest and Ramex, S.A. ceased production. [Ladronzuela (1949), a production with an original screenplay, does list Ramex, S.A. in its credit titles, but that film is considered to be solely a Mexican enterprise.]
Malú Gatica's character is named "Lucy," in a nod to Lucille Ball, who was in the original 1939 English-language version.
Los que volvieron (1948) was a remake of the RKO film Five Came Back (1939), directed by John Farrow and starring Chester Morris and Lucille Ball. Farrow also directed the English language remake, Back from Eternity (1956), starring Robert Ryan and Anita Ekberg.
The onscreen credits of Los que volvieron (1948) include an acknowledgment to the companies Red Aerea Mexicana and Transportes Aereos Centroamericanos for their collaboration in the production of the film.