THE PRODIGAL BOXER features Chinese folk hero Fong Sai Yuk (aka Fong Si Yu), the subject of dozens of HK kung fu films. The role is played by Meng Fei as a callow, unschooled youth and wrongfully accused murderer. Two vicious masters of the local kung fu school, seeking revenge against Fong Sai Yuk, attack his home and kill his father while Fong is away. Fong’s attempts to avenge the death of his father result in his being badly beaten. Fong trains at the hands of his martial artist mother as she puts him through rigorous training and an herbal bath that makes him invulnerable. A trail of revenge is set in motion with Fong against the two masters, played by formidable kung fu villains Yasuaki Kurata and Wang Ching. Can a year's worth of training prepare Fong Sai Yuk for his deadly confrontation with the vicious masters?
| Actor | Role |
|---|---|
 Mang FeiFong Sai-Yuk | Fong Sai-Yuk |
 Maggie LeeSiu Pin | Siu Pin |
 Pai HungFong Sai-Yuk's mother | Fong Sai-Yuk's mother |
 Yasuaki KurataIron Hand Tan | Iron Hand Tan |
 Wong ChingTan's brother | Tan's brother |
 Sun LanThief | Thief |
 Tung Choi-BoGeneral Lei | General Lei |
 Sze-Ma Wah-LungFong Sai-Yuk's father | Fong Sai-Yuk's father |
 Wong Yuet-TingNot listed | Not listed |
 Chai LamFather of death student | Father of death student |
 Max Lee Chiu-ChunFriend of Fong Sai-Yuk | Friend of Fong Sai-Yuk |
 Chan Dik-HakFriend of Fong Sai-Yuk | Friend of Fong Sai-Yuk |
 Fung Hak-OnFriend of Fong Sai-Yuk | Friend of Fong Sai-Yuk |
 Brandy Yuen Jan-YeungFriend of Fong Sai-Yuk | Friend of Fong Sai-Yuk |
 Yuen Shun-YiFriend of Fong Sai-Yuk | Friend of Fong Sai-Yuk |
 Danny Chow Yun-KinFong family's servant | Fong family's servant |
 Tam BoFong Family's servant | Fong Family's servant |
 Lam YuenNot listed | Not listed |
 Lau Kar-WingTan's thug | Tan's thug |
 Wong Shu-TongTan's thug | Tan's thug |
 Yuen Cheung-YanNot listed | Not listed |
 Jack Long Shi-ChiaNot listed | Not listed |