A mysterious hypnotist (Chester Morris) reverts his beautiful assistant (Marla English) back into the form of a prehistoric sea monster that she was in a past life.

After her husband is gunned down, Rose Hood takes his place as sheriff of a small Western town.

Deep in the jungles a mad scientist is using the natives’ voodoo for his experiments to create an indestructible being to serve his will. When a party of gold seekers…