Brain That Wouldn’t Die/The Amazing Transparent Man(1959)

BRAIN THAT WOULDN’T DIE: A scientist keeps alive the decapitated head of his fiancee after she is injured in an auto accident. Slowly, she goes mad while he searches for another body.

THE AMAZING TRANSPARENT MAN: A mad scientist makes a convict invisible to help him steal radioactive materials from a local lab. However, the subject has alternate plans for his new found power, once invisible he sets out on a bank heist crime spree.