取得西经的唐僧师徒四人因为长期在天宫无所事事，他们失去了“勇气”这个品质，导致失去了法力，也被贬下凡间。想要重新回到天宫、恢复法力，他们需要在凡间寻找“勇气”。可是他们到哪里寻找呢？前路茫茫之际，他们遇上了叫卖“天堂圣水”的牛魔王。牛魔王心里小算盘一算，居然要打唐僧师徒的主意，这次可有得闹了

          The four Tang Priest and his disciples who obtained the scriptures in the west lost their "courage" because they had nothing to do in the Heaven for a long time, which led to the loss of their magic power and were banished to the earth. To return to Heaven and restore their powers, they need to find "courage" on earth. But where would they look for it? The road before the vast occasion, they met selling "heaven holy water" cattle devil king. The cow devil king's mind small abacus to calculate, actually want to hit Tang Priest and apprentice's idea, this can have to make trouble