Dr. Sun leads a movement to free China from its Japanese occupation. While on a tour of China he is constantly assaulted by assassins hired by the Manchu leaders. The Chun Do school of martial arts is tasked to safeguard Dr. Sun's passage. Meanwhile, Chen Zhen is challenged by a Russian fighter but not as a means to kill him, he wishes to learn the ways of Chinese kung fu.

小胖从小就失去了母亲，父亲另娶一房，使得小胖常常遭到后母的虐待。悲愤之中，忍无可忍的小胖决定离家出走，依靠自己的力量寻找母亲的踪迹。
小胖来到了城中，邂逅了扒手阿国和小花旦小虎，几经波折，三个单纯可爱的孩子之间结下了深厚的友谊，而阿国亦决定改过自新，金盆洗手，为了生存，三人进了京戏班打拼。某日，三个孩子在后台遇见了活泼可爱的小莲和哑巴嫂，哑巴嫂带给了三个孩子久违的温暖和呵护。小胖意外的遇见了父亲，父亲要带小胖回家，让小胖没有想到的是，哑巴嫂竟然就是自己的母亲，然而此时的父亲已经有了一妻一女，面对失散的妻子，他无法相认。

A young martial arts kid travels by accident from another dimension to our world in search of a magical swordsman.