宋末蒙(🔨)古蒙哥大汗南下侵宋，途(🔼)中遇到飞(😘)天(tiān )炮阻击(jī )身受重伤。后法王虽偷得飞(fēi )(🛤)天炮，然蒙(méng )哥伤(shāng )势(shì )加(😧)重(chóng )(🎾)，只得撤兵(bīng )。返程中(zhōng )被(♑)忽(hū )必烈偷袭(⚫)，逃(táo )入雪山。蒙哥感(gǎn )到(🕖)命不久(🙍)已，写下血书(shū )，传(🚥)位尚(shàng )(🕌)年幼(📞)王(wáng )子海(🥞)都后自(zì )尽。大(😻)雪山(shān )(🖍)中(zhōng )人马走散，飞天炮和血书失踪，海都逃出(🌚)雪山后(🛑)遇到受伤的法(fǎ )王，原来他受(🥎)到中(zhōng )(💻)原三(🙂)大(📙)高手的袭击，他们一(🙄)起返回雪山找寻(xún )其它队伍但(🥫)是雪(👃)山迷宫使他们放(fàng )弃。与(⛳)此(cǐ )同时三大高(gāo )手也感无力进(🕯)入雪(👣)山，将进(❕)雪山迷城的(de )地(🍑)图分成三(sān )份交(jiāo )各人保存(cún )。法王带着海(hǎi )都(dōu )勉强到达(dá )(🌼)师弟银枪法王处，将海都托(tuō )(🐡)付给师(shī )弟后毒(🤥)发身(📛)亡。海都从(🥤)此(cǐ )身负夺(duó )回帝位的重任(rèn )。