Kham is the last of a family line of guards who once watched over the King of Thailand's war elephants. He grows up forming close relations to his elephant, Por Yai and his calf, Kohrn. During Songkran festival, the elephants are stolen with help from Mr. Suthep, a local MP and his son who are collaborating with elephant poachers. Kham discovers that they are in the hands of Johnny, a Vietnamese gangster who runs a Thai restaurant named Tom Yum Goong Otob in Sydney, Australia.
Kham arrives in Sydney, and is stalked by the police as soon as he leaves the airport. He is eventually caught by Inspector Vincent and driven away in Mark's car. When the car stops outside Tom Yum Goong Otob, Kham sees Johnny leaving. He escapes and finds Johnny talking to Pla, a prostitute. Kham follows a minion as he jumps off a bridge. He takes that gangster out and manages to coerce another to lead him to Johnny's hideout, interrupting a drug deal. Outraged, Johnny summons countless extreme sports enthusiasts, who arrive to fight Kham. Kham defeats them one by one, and finally faces a quad bike rider, whom he takes down as well.
Exhausted, Kham falls asleep in an alley. Pla brings him to her apartment. In his sleep, he dreams of an epic battle involving war elephants and the Jaturangkabart, the elephant protectors. When Pla leaves, Kham wakes up to the sound of police sirens, and climbs down a pipe to make his escape.