Bull Demon King, also known as Marshal Iron Bull, was a villain in Journey to the West. He was originally a marshal in the Heavenly Palace, but he was expelled from the Heavenly Palace because he had a conflict with the gods. He was demoted to the mortal world and became a demon king. In the mortal world, he had a fierce battle with Sun Wukong and other Buddhist scriptures teams. In the end, he was defeated by Sun Wukong and fled back to the Demon King's Realm. The Bull Demon King's personality was very cunning and good at changing. He had super strength and endurance, and was also an extremely ferocious demon. His image in Journey to the West was very popular among readers and was considered a charming and dangerous villain.