Quest For Love (1971)

Scientist Colin Trafford (Tom Bell) is cast into an alternate universe when a demonstration of his latest invention goes horribly wrong. In this reality, World War II never happened and history is subsequently slightly skewed. Trafford finds that he's not a scientist here but a writer married to the beautiful Tracy (Joan Collins). An accident throws him back to his own reality, but he's so obsessed with Tracy that he sets out to find her counterpart in his own world.