Crippled Avengers

Three men who have been physically disabled by a vindictive martial arts master and his physically-disabled son ally together and learn kung fu from an elderly martial-artist and his mentally-disabled pupil, so they can avenge themselves.

Crippled Avengers is a 1981 drama action movie directed by Cheh Chang, starring Feng Lu, Chen Kuan-Tai, Phillip Chung-Fung Kwok. It holds an IMDb rating of 7.3/10 from 3,462 votes and runs 1h 44m.