Kutsal Buda heykelinin başı, Ong-Bak, bulunduğu köyden çalınır ve halk bu hırsızlığın laneti ile sefalet içine sürüklenir. Zira, Buda heykelinin köye bereket getirdiğine ve köyü koruduğuna inanılmaktadır. Köy halkı genç Ting'i seçerek, Bangkok'a gidip heykelin başını köye geri getirmesi için görevlendirir. Ting bu zorlu görevde yer altı dünyasında ayakta kalmak için bildiği dövüş tekniklerini sonuna kadar kullanacaktır...

Ong-Bak : Savaşçı

While animal hunting, Wittaya and Lokrai inadvertently offend Nang Takien, the guardian spirit of the forest, who then kills Lokrai. Wittaya is forced to take care of his friend's son, Kham Thong. As a young man, Kham Thong falls in love with Wittaya's daughter Porn but Wittaya prefers Trai, a civil engineer who came to their village to coordinate the building of a dam. When the dam was completed, the village flooded and Wittaya was tasked with clearing every tree, including a big Takien tree.

Takien

Fak, a young Thai man who leaves the monkhood to care for his ailing father. When he returns home, he finds his father has married a much younger woman. She is very beautiful, but she is also mentally unbalanced.