The Man Who Thought Life(1969)

Original title: Manden der tænkte ting

The mysterious Mr. Steinmetz has acquired the ability to create things and beings by will alone. Only, after a while his creations invariably disappear. He therefore approaches a famous brain surgeon, Max Holst, who he hopes can help him with this problem. When Max refuses, Steinmetz brings his doppelgänger into being to replace him.