Red Boy， the Bull Demon King and Princess Iron Fans son， had cultivated his physical and mental capacities and pollessed magic abilities. With powerful magics he always had the idea of eating the meat of Sanzang， the Tang Priest （whose meat could make creatures live longer） to lengthen his life. One day while he was watching in the sky， he saw Sanzang and his disciples coming from afar. He knew that the disciples had excellent fighting skills， so he planned to capture Sanzang by making use of the priest's kindness and muddled mind， rather than use force. At a spot just ahead of where Sanzang and his group were， Red Boy turned himself into a boy of seven and hung himself on the top of a tree with his hands and feet tied with a rope and cried for help. The Tang Priest heard the boy's cries and asked Monkey to release him. Monkey， seeing that the boy was actually a demon in disguise， told his master not to bother. Sanzang got angry， and he asked Pig to bring the boy down from the tree； he ordered Monkey to carry he boy on his back. As they started to go ， Red Boy jumped into mid-air， leaving behind a false Red Boy for Monkey to carry. To kidnap Sanzang， Red Boy hurled a whirl of wind at him. Sanzang disappeared. Monkey knew this was done by the demon and he asked Pig and Friar Sandto look after the luggage and he hurried to the Huofang Cave in the Withered Pine Valley to look for his master. A fierce battle ensued between Monkey and Red Boy. Knowing it is impossible to defeat Monkey， Red Boy Spurted three types of flames which were so powerful even the Dragon King could not put out. Monkey， knowing he could not win， jumped out of the sea of fire and went to the South Sea to ask the Goddess Guanyin for help. The goddess vanquished Red Boy and brought him to the South Sea. Monkey saved Sanzang and Sanzang and his disciples continued their journey to the West in search of Buddhist scriptures. 牛魔王和鐵扇公主的孩子紅孩兒，修煉得道，神通廣大，爲益壽延年，他一心想各異唐僧肉。一天，他正在空中瞭望，看見唐僧師徒遠遠地走來，他知道唐僧的徒弟武藝高強，硬拼怕不能取勝，於是，他想利用唐僧不辨真僞，心慈面軟的特點來智取。他把自己變成七歲的孩童，用繩捆住手腳，高高地吊在樹枝上喊“救人”。唐僧聽到喊聲，讓悟空去解救。悟空認出那是妖怪變的，叫師父少管閒事。唐僧動怒，又要八戒將紅孩兒救下。當唐僧讓悟空背上紅孩兒走時，悟空背的只是個假的，紅孩兒真身早已跳到九霄雲外，並颳起一陣旋風，趁機劫走了唐僧。風停後，唐僧沒有了，悟空知道是妖怪搗的鬼。他記八戒和沙和尚看好行李，自己趕忙來到枯鬆澗火方洞找師父。悟空和孩兒一場惡戰，紅孩兒鬥不過悟空，便噴出龍王也不能熄滅的三味真火，悟空急忙跳出火陣，見不能取勝，便到南海請觀音菩薩。菩薩降服了紅孩兒，把他帶回南海。悟空救出唐僧，師徒四人繼續往西天取經。
