Four Sided Triangle is a 1953 British science-fiction film based on the 1949 novel of the same name written by William F. Temple. It’s about two scientists who create a duplicate of the woman they love so that everyone wins! Only they don’t.
The film is directed by Terence Fisher (The Curse of Frankenstein), and stars Stephen Murray, Barbara Payton and James Hayter. It was produced by Hammer Film Productions.