The Head (1994)

Jim awakens to find that Madelyn has been possessed by Gork. Roy explains that the Gork race has made plans to invade the heads of Earthlings, and he came to Earth with a machine that could stop the invasion -- but it was broken into five pieces and scattered across the planet. Meanwhile, Dr. Elliott bursts in with his cronies to interrogate Dr. Axel. He tells of his childhood encounter with a Gork, then proceeds to kidnap the head specialist.