Sun Wukong, also known as the Monkey King, is a legendary monkey who once trapped the Demon Bull King inside a mountain. At some point in time after imprisoning the Demon Bull King, the Monkey King took a liking to a young teen by the name of MK and thought that he would perfect for his successor. After meeting MK at Flower Fruit Mountain, he encourages MK to believe in himself and take the Golden Staff back after it was taken by Princess Iron Fan.
After several weeks, the Monkey King trained MK as well as giving him advice. However, when the Monkey King learned that Macaque was secretly training with MK so he can steal his powers, he engages with in a fight with him and was able to win after reminding MK about his training.

When the Monkey King was captured by the Spider Queen during New Year's, he, along with the Demon Bull King and several other demons were having their powers extracted until they were freed. He then teamed up with MK's team and the Demon Bull Family to defeat the Spider Demons, but not before realizing that Lady Bone Demon returned.

After learning that Lady Bone Demon was freed from her tomb, he left Flower Fruit Mountain to look for a weapon that could help him defeat her. Although he was too late after he and MK lost their powers, he continued to look for the weapon, but with the help of MK and his team.