Human: What is the name of the mad scientist and villain in the story "The Case of Summerfield"? Assistant: 
The mad scientist and villain in the story "The Case of Summerfield" is called Black Bart. William Henry Rhodes published in 1871 the tale "The Case of Summerfield" in the Sacramento Union newspaper, and introduced weapon of mass destruction. A mad scientist and villain called Black Bart makes an attempt to blackmail the world with a powder made of potassium, able to destroy the planet by turning its waters into fire.