The monster wishes to take revenge and eat the flesh of the Tang Priest. So he makes a plan to trick the Tang Priest to cross the river by boat, and then use the opportunity to pull him down to the bottom of the river. The three brothers find the Residence of the River Turtle, which is the hiding place of the monster. It turns out that the monster has seized the mansion of Soft-shelled Turtle. Pig and Friar Sand lure the monster out of the river, while Monkey helps from above the water.
妖怪既欲報一鈀之恨，又想吃唐僧肉，遂訂計騙唐僧乘船渡河，趁機將唐僧攝入水底。弟兄三人尋到妖怪藏身的“水黿之第”——原來是癩頭黿的府第爲妖怪強佔。八戒沙僧誘騙妖怪出水——水上有孫悟空接應。