Four Sided Triangle

Four Sided Triangle is a 1953 film about two men who develop a "reproducer" which can exactly duplicate any object. One of them, crushed when their childhood friend marries the other, convinces her to allow him to duplicate her, so that he may have a copy of her for himself. The experiment, at first deemed a success, seems to have worked only too well as the duplicate is such an exact copy that she also loves his friend.
 * Directed by Terence Fisher. Written by Paul Tabori, based on a novel by William F. Temple.

She lived two amazing lives under his spell! (taglines)

Lena Maitland

 * An empty mind... and a new beginning!

Taglines

 * She lived two amazing lives under his spell!

Cast

 * Barbara Payton — Lena Maitland/Helen
 * James Hayter — Dr. Harvey
 * Stephen Murray — Bill Leggat
 * John Van Eyssen — Robin Grant
 * Percy Marmont — Sir Walter
 * Glyn Dearman — Bill as a child
 * Sean Barrett — Robin as a child
 * Jennifer Dearman — Lena as a child
 * Kynaston Reeves — Lord Grant
 * John Stuart — Solicitor
 * Edith Saville — Lady Grant