Dr. Charles Conway (John Carradine) is experimenting with artificial glands to make people live longer, working with Lobo (Tor Johnson) and his assistant Dr. Sharon Gilchrist (Marilyn Buferd, a former Miss California). Those that get these glands think they’re getting one surgery and get shuffled off for something else.
One of those patients is Grace Thomas (Allsion Hayes, Attack of the Fifty Foot Woman; she died as a result of nutritional supplements, specifically a calcium supplement that had abnormal levels of lead), who is suffering from depression which means that she’s due for some surgery that will help John Carradine live eternally.
Originally called The House of Monsters, this was filmed over approximately five days and is the third movie in which Johnson played Lobo (Bride of the Monster and Night of the Ghoul would be the others).
Director Boris Petroff, using the name Brooke Peters, also directed Anatomy of a Psycho. I’ve heard that the writer of this movie, Jane Mann, was Petroff’s wife. I’ve also heard that its a pen name for Ed Wood.