"Havoc in Heaven." It is the 8th chapter of the novel and is one of the most famous and memorable episodes in the story.

In this chapter, Sun Wukong causes chaos in heaven by stealing the peaches of immortality, crashing a royal banquet, and challenging the authority of the Jade Emperor. He defeats the armies of heaven and even defeats the gods themselves, including the Four Heavenly Kings and Nezha, a powerful deity.

The Jade Emperor is unable to defeat Sun Wukong, so he calls upon the Buddha for help. The Buddha uses his magic to subdue the Monkey King and trap him under the Five-Finger Mountain for 500 years.

The "Havoc in Heaven" chapter is significant because it establishes the character of Sun Wukong as a rebellious and powerful figure who is not afraid to challenge authority. It also sets the stage for the rest of the novel, in which Sun Wukong joins Xuanzang on his journey to obtain Buddhist scriptures and faces many challenges and obstacles along the way.