Professor Fernandez is studying the metamorphosis in living organisms to cure his daughter of a strange disease that occurs in full moon nights.

A young attractive woman from a rich Mexican family is under a curse that causes her to transform into a wolf-woman at night and kill people. She falls in love with the doctor she sees (in order to get cured from her curse) who is also a werewolf. Unfortunately for both, their love filled killing spree comes to an end when they are killed by a trained, werewolf-killing dog.—texasboyy