I will bet you didn't see this one coming. It's the sequel to the original Invisible Man. This time it's Frank Griffin (John Griffins brother) who has the invisibility formula but instead of using it on himself, he uses it to help a friend wrongly convicted of his brothers murder. He has to turn him invisible to get him out of jail and help him find the real killer before the madness sets in. In the original move the formula was called Monocaine but in the sequel it was known as Duocaine. It's Vincent Price giving one of his best performances. Also look for Alan Napier better known as Alfred the butler on the Batman tv show.