Crippled Avengers

Crippled Avengers is a 1978 Shaw Brothers kung fu film directed by Chang Cheh and starring four members of the Venom Mob. It has been released in North America as Mortal Combat and Return of theDeadly Venoms. The film follows a group of martial artists seeking revenge after being crippled by Tu TinTo Chen Kuan Tai, a martial arts master, and his son Lu Feng.

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 twohanded 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 Cho Chang for supporting the same sentiments as Wei. Another traveler who wishes to hire the blacksmith has his legs chopped off below the knee at the orders of Chu Twin, who had declared the blacksmiths business off limits.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 Master Twin, his son, 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 head vice. ........

Source: Wikipedia