In 1997, before the visit of the pope to Rio de Janeiro, Captain Nascimento from BOPE (Special Police Operation Battalion) is assigned to eliminate the risks of the drug dealers in a dangerous slum nearby where the pope intends to be lodged. Captain Nascimento is trying to find a man to replace him because his wife is pregnant and he intends to quit the command and become a trainer of the new recruits. Meanwhile, the two idealistic friends Neto and Matias join the Military Police force expecting to become honest policemen and fight the criminals. However, they see only corruption, lack of competence and stupid bureaucracy in the Military Police, and after a serious incident in the Morro da Babilônia, they decide to join the BOPE. The lives of Capitain Nascimento, Neto and Matias are entwined along the next months, first in the tough training period and then in action against drug dealers...

After a bloody invasion of the BOPE in the High-Security Penitentiary Bangu 1 in Rio de Janeiro to control a rebellion of interns, the Lieutenant-Colonel Roberto Nascimento and the second in command Captain André Matias are accused by the Human Right Aids member Diogo Fraga of execution of prisoners. Matias is transferred to the corrupted Military Police and Nascimento is exonerated from the BOPE by the Governor. However, due to the increasing popularity of Nascimento, the Governor invites him to team-up with the intelligence area of the Secretary of Security. Along the years, Fraga, who is married with Nascimento's former wife, is elected State Representative and Nascimento's son Rafael has issues with his biological father. Meanwhile Nascimento and the BOPE expel the drug dealers from several slums but another enemy arises: the militia led by Major Rocha and supported by the Governor, the Secretary of Security and politicians interested in votes. Nascimento is manipulated to help ...