Unearthly Stranger is a 1963 British science fiction film directed by John Krish and starring John Neville. It was released in the UK by Independent Artists (Production) Limited.
The film was written by Rex Carlton based on an idea by Jeffrey Stone. Its US release was in April 1964.
Dr. Mark Davidson, government scientist, meets a mysterious woman and is married quickly. He knows little of her past. His government superiors want to know more about his wife, especially certain strange attributes that suggest she may be more than she appears. When it turns out she actually does love her husband, they both become targets.