Dr. Lloyd, played by Warren William, is a character from the 1941 film The Wolf Man.
Dr. Lloyd is initially highly skeptical that Lawrence Talbot is turning into a wolf. He cannot be convinced at first that when Talbot killed Bela, that Bela was a wolf, not a man.
He attempts to convince Sir John Talbot that his son may have a psychosis. But eventually, as more people turn up dead, Dr. Lloyd seems to come around to the idea that Talbot is indeed a werewolf.