The Shadow of the Cat

No supernatural creatures in this Hammer film, but a lot of the human cast in The Shadow Of The Cat thinks Tabitha is the feline from hell. Not that they don't deserve what happens to them.

The film opens with Andre Morrell murdering his wife who controls the family fortune and with the connivance of two servants Andrew Crawford and Freda Jackson. The only witness to the event was Tabitha the cat and the sight of the cat gives them guilty consciences.

Other relatives arrive including Barbara Shelley and her fiancé Conrad Phillips and Shelley is the only one that Tabitha behaves with. The others now influenced by Morrell all hate the cat, ascribing all kinds of supernatural behavior. And attempts to trap and kill it result in a whole lot of the cast being eliminated.

This is a good one from Hammer because it relies on the human failings for these people to fail. Tabitha has no powers, she's just smarter than the rest of the humans in the cast.

Cat's got Pussynality.