Scientist Andre Delambre becomes obsessed with his latest creation, a matter transporter. He has varying degrees of success with it. He eventually decides to use a human subject, himself, with tragic consequences. During the transference, his atoms become merged with a fly, which was accidentally let into the machine. He winds up with the fly's head and one of it's arms and the fly winds up with Andre's head and arm. Eventually, Andre's wife, Helene discovers his secret and must make a decision whether to let him continue to live like that or to do the unthinkable and euthanize him to end his suffering.