Frankenstein Conquers the World

Frankenstein Conquers the World (1965) is a horror, science fiction directed by Ishirō Honda rated 6.7/10.

During WWII, Germans obtain the immortal heart of Frankenstein's monster and transport it to Japan to prevent it being seized by the Allies. Kept in a Hiroshima laboratory, it is seeming lost when the United States destroys the city with the atomic bomb. Years later a wild boy is discovered wandering the streets of the city alone, born of the immortal heart.