When chaos first began, the first demon in the world was born, named Yuandi (voiced by Zhang Lei), and was revered as the ancestor of demons. Millions of years later, the former demon king Sun Wukong (voiced by Bian Jiang) was rescued from the Five Elements Mountain by Tang Monk (played by Su Shangqing). Wukong promised to protect Tang Monk and went to the West to obtain Buddhist scriptures. The legendary demon ancestor Yuandi appeared again, and the three realms were in danger. The two generations of demon kings were destined to have an ultimate battle, but this time, Sun Wukong met a real strong enemy.