In order to save Mount Huaguo, which has no rain all year round, Sun Wukong goes alone to the Three Stars Cave to learn the infinite changes of immortal arts from Bodhi the Elder. Meanwhile, the Dragon King of the East Sea is secretly developing a drug to take revenge on the Heavenly Court. This drug will allow him to control the consciousness of its victim and turns them into a ruthless killer. After Sun Wukong and his classmates discover the Dragon King's plot, they decide to work together to try and stop him. (Source: TMDB)

Based on Journey to the West by Wu Cheng'en.