The monkey king in Avatar the last air bender

The story of Sun Wukong is known out in the four Nations of how he fought the spirits. Sun Wukong, known for his immense power and mischievous nature, initially caused chaos in the Spirit world, rebelling against the Spirits and declaring himself "Great Sage Equal to Spirits". Beside the Avatar isn't the only being able to go to Spirit world. sun wukong is able to go to the spirit world and the mortal realm. When sun wukong went against the spirits, two spirits and the Avatar fought against sun Wukong and the spirits who fought him are known as Raava and Vaatu. Two spirits who despise one another join forces to fight Sun Wukong with the help of the Avatar. They were able to defeat him by Imprisoning him under a mountain. Dad is where Sun Wukong stayed for the next centuries until one day. The new Avatar known as aang freed Sun Wukong to help him bring peace to the world.