Magkaibang Lahi tells the story of two sisters, Corazon del Rio (Corazon Noble), a former movie star before the war and Nenita (Rosita del Cielo). Cora was among the victims of Japanese atrocities during the last few weeks before the fall of Manila in 1945. She was bayoneted in the arm something that really happened to actress Corazon Noble. In the hospital while recuperating and being cared for by Charlie, the American officer who saved her life (the ubiquitous Art Cantrell) Nenita, Cora’s sister meets the dashing American and a love affair develops. In the meantime the wealthy Fidel (Ely Ramos) resurfaces and is frantically searching for Cora. He is trying to rekindle a romantic past that was ruined by Fidel’s mother (Isa Bonita) who looks down on movie actresses. Nenita and Charlie got married but the American officer has to remain in Manila to await his discharge. Nenita travels to the U.S. with Cora and both women receive the shock of their lives when they are given a frosty or…