But isn't Shivers basically to do with an experiment about replacing an organ with a parasite, that's pretty sci-fi inmo.
But i get what you mean.
Although shouldn't that mean we should take Alien out the horror list?
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.