Doctors are being murdered in a bizarre manner: bats, bees, killer frog masks, etc., which represent the nine Biblical plagues. The crimes are orchestrated by a demented organ player with the help of his mute assistant. The detective is stumped until he finds that all of the doctors being killed assisted a Dr. Vesalius on an unsuccessful operation involving the wife of Dr. Phibes, but he couldn't be the culprit, could he? He was killed in a car crash upon learning of his wife's death.
Continuity After Vulnavia dances with Phibes, he lowers the cage of bats into the cellar. Vulnavia runs up the stairs, then appears downstairs seconds later, in different clothes.
Continuity During the operation Vulnavia attacks a painted backdrop with an Axe. She is shown alternating between being in front of it and behind it in quick succession.
Crew/Equipment Visible You can clearly see wire attached to the flying bat.
Crew/Equipment Visible In the shot where the car is chasing the plane before takeoff, you can see the shadow of the camera and camera man.
Revealing Mistakes Virginia North smiles broadly as she dances with Vincent Price. Her face is concealed most of the time, but if you look closely, you can see her face for a moment, and she is clearly trying not to laugh at Vincent Price's deliberately camp performance.
The "Vampire Bats" were really flying foxes, very docile fruit-loving bats.
In order to gain more publicity this film was advertised as Vincent Price's 100th feature film.
The name "Vesalius" is a reference to Andreas Vesalius, a Flemish scientist who cut up corpses to learn about the workings of the body.
The rat curse was originally intended to take place on a boat. Robert Fuest changed it to inside a plane, as he felt the boat could have been escaped from.
For visual reasons, the plagues of flies and gnats were replaced with rats and bats.
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