Chu Twin, a master of Tiger style kung fu, returns home to find his wife murdered and his son crippled, having his arms cut off from the elbows down. Chu Twin has iron arms constructed for his son and trains him in the art of kung fu. Despite getting revenge on the wrongdoers, they are still filled with bitterness and anger toward the world. During Chu Twin's reign over his village, he and his son cripple four men who defy them.
The town blacksmith, Mr. Wei, becomes annoyed and verbally abusive toward Chu Twin when he and his entourage occupy the upstairs portion of a tavern when he wants to use it. He is forced to drink a liquid to make him mute, and, when he remains defiant, is deafened by a two-handed ear clap delivered by Chu Twin himself. After Wei is forced to leave the tavern, a traveling hawker is blinded by the iron fingers of Chu Twin's son, Chu Cho Chang, for supporting the same sentiments as Wei. Another person has his legs chopped off below the knee at the orders of Chu Twin, for bumping into his son.
One day, a young kung fu master known as Yuan Yi comes to town. When he discovers the tortures committed by Chu Twin, he vows to avenge the three crippled men. Yuan Yi is good, but he is young and no match for Chu Twin, his son, Chu Cho Chang, and his enforcer, Mr. Wan. Yuan Yi is defeated and bound in chains. Chu Twin turns him into an idiot by crushing his head in an iron vice.
Together, the now four disabled men travel to Yuan Yi’s master’s temple, where they are trained in kung fu. Each heightens his remaining senses to compensate for his individual disability. Wei, deaf and mute, learns sign language to communicate and wears reflective bands so that he can see what he cannot hear. The hawker's ears become sensitive, able to hear the falling of leaf and hit it with a dart. Mr. Wei outfits the legless man with prosthetic iron legs and feet. Yuan Yi, still a kung fu master, needs no further training, but constantly laughs and acts if he were playing a child's game while fighting. The four men make plans to return to town on Chu Twin’s 45th birthday and exact their revenge. Mr. Wan hires other kung fu masters to stop the vengeance-minded men. The other masters, though very strong, underestimate the four and end up defeated.
In the final fight, the four misfit masters defeat Chu Twin and Chu Cho Chang; however, Yuan Yi is killed sacrificing himself for the blind master, all the while giddily laughing like a child.
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