Cobra Woman

After Ramu's fiancée, Tollea, is kidnapped by a lost tribe, the sailor and his friend Kado set out across the seas to find her. He discovers a Pacific Island paradise ruled by Tollea's evil twin, Naja, the Cobra Woman, who commands death to all outsiders.

Not only does Naja have designs on her new prisoner Ramu, but she also tries to eliminate any competition from her benevolent sister.