This one was scripted by Bertram Millhauser, who worked on most of Universal's Sherlock Holmes movies, and I kept expecting Basil Rathbone and Nigel Bruce to show up and sort matters out. In their absence, Robert Griffin comes to England after escaping from a Capetown asylum for the criminally insane, and accuses his old friends Sir Jasper and Lady Irene Hedrick of deliberately leaving him for dead after he was hit by a falling branch on their South African expedition years before. They plead that his injury was showing the expedition down, so they'd left him in the care of the most trusted bearer. This does sound a bit flimsy, and when Griffin comes over all woozy after accepting a drink from Lady Irene, Andrew and I figured she was the real villain and had arranged the original accident.
Griffin falls into a river, falls in with a local yokel who pulls him out, and they try unsuccessfully to sue/blackmail the Herricks. When that fails, Griffin wanders about muttering angrily until he meets mad scientist Dr. Drury (John Carradine). Drury's not such a bad sort, although his animal testing probably isn't up to modern RSPCA standards; he's got a lot of Invisible animals, including his pet parrot Methusulah and his guard dog Brutus. Griffin volunteers to be the first human test subject, then takes off while Drury plans to write up the results and present them to the Royal Society.
He goes back to the Herricks' and harasses them invisibly for a while. When their daughter returns home to care for her stressed-out parents, Griffin decides he needs to be visible again. He goes back to Drury, who has just made Brutus visible again via a blood transfusion from another dog, but balks at draining a human's blood to treat Griffin, so Griffin takes his blood, somehow performing a blood transfusion with no medical training or awareness of blood typing, and leaves him dead. So now he's visible again, but effectively a vampire, as the effects of the transfusion keep wearing off, although Brutus appears to be fine, and after a few more scenes, is ultimately the one who kills Griffin. "Wait," we said, "so was Lady Irene innocent the whole time?"
Griffin falls into a river, falls in with a local yokel who pulls him out, and they try unsuccessfully to sue/blackmail the Herricks. When that fails, Griffin wanders about muttering angrily until he meets mad scientist Dr. Drury (John Carradine). Drury's not such a bad sort, although his animal testing probably isn't up to modern RSPCA standards; he's got a lot of Invisible animals, including his pet parrot Methusulah and his guard dog Brutus. Griffin volunteers to be the first human test subject, then takes off while Drury plans to write up the results and present them to the Royal Society.
He goes back to the Herricks' and harasses them invisibly for a while. When their daughter returns home to care for her stressed-out parents, Griffin decides he needs to be visible again. He goes back to Drury, who has just made Brutus visible again via a blood transfusion from another dog, but balks at draining a human's blood to treat Griffin, so Griffin takes his blood, somehow performing a blood transfusion with no medical training or awareness of blood typing, and leaves him dead. So now he's visible again, but effectively a vampire, as the effects of the transfusion keep wearing off, although Brutus appears to be fine, and after a few more scenes, is ultimately the one who kills Griffin. "Wait," we said, "so was Lady Irene innocent the whole time?"