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Two archaeologists on a scientific dig come across a vampire burial ground and discover that the creatures are about to awaken and attack a nearby village.
Young doctor Garondet is summoned by renowned Professor Orloff. At Orloff's castle, Garondet discovers that the mad scientist has created an invisible yet murderous apeman.
Former Countess Clair and Professor Gruber conduct occult research in castle basement of Count Victor, re-animating people to kill for them.
A group of celebrating friends make a pact with a demon to stay the night or someone loses their soul, only to find out the demons they are fighting might be the ones they carry inside.
