Working in Dr. Cranley's lab, scientist Jack Griffin was always given the latitude to run some of his or her own experiments. His abrupt departure has Cranley's daughter Flora focused on him. Griffin has taken a room at the local Lion's Head Inn, expecting to reverse an experiment he ran on himself who made him invisible. But the drug has additionally warped his mind, which makes him more aggressive and dangerous. He's willing to do whatever is required to restore his physical appearance.