Krakatau.

Somad and Biang Terona are sent by their master at Krakatau martial arts school to look for the rebellious student, Bodin, who is Somad’s real father. Bodin manages to marry the wife of a landlord and takes over the wealth but he becomes a dictator. His son, Tirta, also manages to displace Surya as inheritor of Bodin’s wealth. Surya is the son of Tirta’s mother with her previous husband. Finally, Biang Terona defeats Bodin, and Somad reveals that Bodin is his father. The film ends with the eruption of the Krakatau Volcano.