After Bo's mother Fei-Yan is discovered mysteriously injured, Bo and her younger sister Jen are sent on a school trip to attend an exhibition of ancient Chinese warriors. There, along with other children visiting the museum, Trix, Vicky and Martin, they find themselves transported to a mysterious cave where they meet Shen, a Chinese water dragon. Shen reveals that they are now in the Spirit World and have become the new Spirit Warriors with an important task to complete. They must collect the 12 magical spirit pieces from the spirit worlds of Wood, Water, Earth and Fire. However, the evil Li and his henchman Hwang are also hunting the pieces, and if Li finds them first, he'll control not only the Spirit World, but also the real world—and Fei-Yan will die.