The legendary Loreley has been living for centuries in a grotto beneath the river Rhein in Germany. Every night when the moon is full, she turns into a reptile-like creature craving for human blood. When one girl after another of a nearby boarding school is killed by her, a hunter named Sigurd is engaged to kill the monster.

• Astro C.C.
• Profilmes
• Tony Kendall
• Helga Liné
• Silvia Tortosa
• Josefina Jartin
• Loreta Tovar
• José Thelman
• Luis Induni
• Francisco Nieto