While traveling the Silk Road, Tangseng and his three disciples encounter a young boy hanging upside down from a tree. They rescue him only to discover that he is really Red Boy, a powerful and malevolent demon and, it turns out, Sun Wukong's nephew. Ignoring this family relationship, the demon kidnaps Tangseng and plans to eat him. The three disciples battle the demon but soon discover that he can produce deadly fire and smoke which nearly kills...