The Invisible Man's Revenge

Robert Griffin was duped and left for dead in Africa by some business associates several years ago. Having survived against terrible odds, the revenge-minded Griffin returns to England where he encounters a cracked scientist hoping to test a special new formula. Vengeance is soon at hand. The demented doctor's injection renders Robert invisible, thus allowing him to go after those who robbed him of his former life. Griffin systematically destroys his enemies with this cloak of imperceptibility but eventually discovers that his new powers cannot be turned on and off as easily as a light switch. The side effects aren't so peachy either...