After the Mantis Fist school attacks the Eagle's Claw school and leaves their teacher for dead, the dying master passes over his senior student, Chen Tien Chun, to anoint his second most senior pupil, Lee Cheh, as new master. Dejected, Chen joins the Mantis Fist school and wins the affection of his new master's daughter, while his former schoolmates plot revenge.

After Japanese warriors execute the Chinese Jingwu kung fu school's headmaster, Chen Zhen, and raid a number of schools in an effort to weed out Jingwu rebels, Zhen's brother, Chen Shen, vows revenge.

When South China martial artist Pan is defeated and killed by North China challenger Tan in a legfighter duel, Pan's younger brother Pak vows to crush Tan with his own unique style of ferocious footwork.

Ah Chi (Ka-Yan Leung) is obsessed with the martial arts and, more often than not, his kung-fu clowning gets him into trouble. Ending up facing Hsia (Eddie Ko) of the notorious Jade Brotherhood is inevitable. As a result, Hsia forces Chi's martial arts master to expel him. Masterless and working for a fish vendor, Chi meets a crafty kid (Yat Lung Wong), whose uncle Chow Tung (Chin Yuet Sang) is a master of the Insane Mantis style. The Jade Brotherhood aims for control of the small town but Chi is training with a new Master and will not accept bullies in the neighbourhood.