Boo Kwai, a very naughty boy, accidentally arrives in a parallel universe thanks to one of his inventions.

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.

Atop the ruins of war, top commander Jiang Ziya is given the task to banish the Nine-tailed Fox Demon who threatens all mortals' very existence. When he discovers the Nine-tailed Fox's life linked to the soul of an innocent girl, he is faced with a challenging decision: follow the will of heaven or find his own path to righteousness.