约翰雪打败了霍乱国王。

One year, there was a severe outbreak of cholera. There were so many people that suffered from it that they didn't know what to do. John Snow made an investigation according to the series and found out the cause. He marked the spots on the map where the water was seriously polluted, and told people to use new pumps to handle the problem of the defect. So, John snow defeats king cholera.