Based on the true-to-life story of Teodoro Asedillo, Fernando Poe Jr. plays the role of an idealistic school teacher from San Antonio, San Pedro, Laguna who became a revolutionary leader against the American Commonwealth government. Dubbed "The Terror of the Sierra" and one of the most feared guerilla fighters during the American Occupation, he fought against the oppressive system that prohibited the use of the Filipino language as a medium of instruction and prevented Filipinos from entering the Department of Public Instruction and for every Filipino's right to determine the future of his country and of generations to come. Founded the labor movement Katipunan ng Mga Anak Pawis in 1929 to protest the unfair labor policies of the government, he was killed by the government forces in his hideout in 1935.