Thomasina is the pet cat of Mary McDhui, the daughter of Scottish veterinarian Andrew McDhui. When Thomasina falls ill, McDhui declares that the pet should be put down. But when Mary and her father try to bury the cat, Lori MacGregor (Susan Hampshire), who is said to be a witch, shows up and attempts to steal it.
The Three Lives of Thomasina is a 1963 fantasy film directed by Don Chaffey about a cat's influence on a family. Patrick McGoohan and Susan Hampshire star alongside child actors Karen Dotrice and Matthew Garber. Based on Paul Gallico's 1957 novel Thomasina, the Cat Who Thought She Was God, the film was shot in Inveraray, Argyll, Scotland, and Pinewood Studios, England, with a screenplay by Gallico and Robert Westerby.