The Brain That Wouldn't Die (1962)
A scientiest and his girlfriend are out enjoying a spirited drive when catastrophe strikes. Dr. Bill Cortner (Jason Evers) escaped unscathed but his girl dies decapitated! Dr. Cortner manages to keep the head alive and takes it back to his laboratory where he hopes to attach the head to a new body. With the help of his disfigures assistant (can't be respectable mad scientist without one) he sets out to find the perfect body. Things become more bizarre when the assistant starts having telephatic communication with the severed head which he is assigned to guard! It's madness not sciene!