"Boxer 3" continues the story of the previous episode "Boxer 2" and is also a prequel to the first episode "Boxer". Tony Jaa reappears as the revenge warrior Tien, who was captured by his old enemy, the sinister high-ranking officer Rajasena (Saranyu Wongkrajang), while experiencing different fighting styles around the world. With the help of his childhood sweetheart Pim (Primrata Dejudom (Jaja)) and friends from the village, Tien's broken body was reincarnated. At this time, when Rajasena invites the evil wizard Crow Ghost (Dan Chupong) with powerful combat skills and dark magic to no avail, a real showdown between good and evil and heroes is inevitable.

"Even if the light of life is extinguished, if the will is firm, the way to a new life will appear before you. Only determination and faith can overcome everything. Overcome the dark side of your heart and you will discover Natayuth , a powerful combat technique that no one has ever seen before."

After being defeated by Demon Crow (played by Dan Chupong), Tien (played by Tony Jaa) lost everything in his life, including his father and his wife. The king of the country Sihadecho (played by Santisuk Promsiri), his stepfather Chernung (played by Sorapong Chatree), his younger brother, and the martial arts he has trained throughout his life. Shockingly, Tien was captured and abused as a result. All he had left was a weak heartbeat.

Tien was rescued and placed in the Arokaya village where he and Pim (Jaja Primrata Dej-Udom) had been studying Khon. The villagers gathered all their strength in the hope of bringing Tien to consciousness and prolonging his life. Among the villagers, there is also Men (Mum Jokmok) who behaves strangely. The villagers meditated to save Heaven and created sacred Buddha statues. In order to appease the gods, Pim presented the wonderful Khon dance as a prayer and tribute.

Master Bua, who was appointed as a holy monk, also helped Tien. He taught Tien how to meditate to bring peace and light to his thoughts. With the four natural elements of earth, water, wind and fire, Tien's faith and heart were baptized, and he discovered an unprecedented powerful martial arts technique-Natayuth.

At the same time, the conspiracy of Lord Rajasena has been going on, that is, to conquer this land. After successfully recruiting Demon Crow, a death killer with devilish martial arts skills, to become his right-hand man, the whole world almost became his world. However, when he learned that Tien had recovered, he immediately killed everyone involved. Pim was captured, he was brought back to the king of Rajasena and was to be publicly executed.

What Tien has to learn now is how to walk through a quiet journey that separates his mind and body. The two will be separated because of his eagerness to take revenge on Demon Crow and Lord Rajasena. generate confrontation. The dark side of Tien's heart almost destroyed him. It seems that the only way to defeat this invisible enemy is when Tien conquers his own thoughts.

Let’s witness the biggest battle in Tony Jaa’s life, in the long-awaited epic movie "Ong Bak 3". This is the final part of the Ong Bak trilogy, where the Buddha with the Scarred Face comes into being and the struggle of a man who was born to be a legend.