Xiyou Ji: Zai Shi Yao Wang

The first demon came to earth at the very beginning of Chaos, he was named Yuan Di and worshiped as Demon Primogenitor. Millions of years later, the Monkey King is rescued by Tang Monk and started to protect him for going on a pilgrimage for Buddhist scriptures. The two demon kings are destined for a ultimate battle.

(Source: moviescore.com)