The story is set in Cambodia in the years following WWI. Evil Count Mazovia (Roy D'Arcy) has come into possession of the secret methods by which men can be transformed into walking zombies and uses these unholy powers to create a race of slave laborers. An expedition is sent to the ruins of Angkor Wat, in hopes of ending Mazovia's activities once and for all. Unfortunately, Armand (Dean Jagger), one of the members of the expedition, has his own agenda.