Fiend Without A Face

 Fiend Without a Face is a 1958 British black-and-white science fiction film that tells the story of mysterious deaths at the hands of an invisible monster that steals human brains and spinal cords. The film was based on an Amelia Reynolds Long short story entitled "The Thought Monster" which was originally published in 1930 in Weird Tales magazine.  (Wikipedia)

^{"New horrors! Mad science spawns evil fiends!" 
"Fiends take form before your horrified eyes!"}