Maniac

Don Maxwell is working as the lab assistant to Dr. Meirschultz, a mad scientist attempting to bring the dead back to life. When Don kills the Dr. and attempts to hide his crime by "becoming" the doctor. When the cat-breeding neighbor Goof sees what's going on, he calls the police, who stop the fight and, following the sound of Satan the cat, find the body of the real Dr hidden behind a brick wall.