Dr Jeffery Stewart and Dr Dan Forbes, two scientists, from the Office of Scientific Investigation must stop a creature that threatens to destroy Earth.
An Austrian general agrees to care for Marcilla, a countess's daughter, while her mother is away. However, Marcilla turns out to be a seductive and dangerous vampire.
After El-Carim, a ruler, plans to capture Sinbad, Princess Jana gets worried and pleads with a magician to turn her into a small bird so that she can fly to Sinbad and inform him about the danger.