蟄伏了1年之久的泰國功夫巨星Tony Jaa以全新面目回歸銀幕。這部新的續集將會對前作中唐突的結尾給出解釋，在「拳霸3」中，Tony Jaa飽受牢獄折磨後武功盡失，後來得到善良村民的幫助重獲新生，並且得到大師指點武功大增，帶著滿腔殺敵怒火回歸..

Tien (Tony Jaa) has lost his fighting skills and his beloved step-father at the Garuda's Wing cliff from the raid led by Lord Rajasena (Sarunyu Wongkrajang). Tien is brought back to life with the help from Pim (Primrata Det-Udom) as well as Men (Phetthai Wongkhamlao) and the Kana Khone villagers. Deep into the meditation taught by Bua (Nirut Sirichanya), Tien finally is able to achieve 'Nathayut'. His talents are put to the test again when his rivals including the Golden-Armored King's Guard, the mysterious killers in black, and The Crow Demon return for the final massive showdown.