'Elite Troop 2: The Enemy is Now Another'; also known as Elite Squad 2) is a 2010 Brazilian action thriller film[3] directed and co-produced by José Padilha, who co-wrote it with Bráulio Mantovani and Rodrigo Pimentel.

The sequel to 2007's Elite Squad, it furthers the plot of a semi-fictional account of BOPE, the special operations force of the Rio de Janeiro Military Police, with a focus on the relationship between law enforcement and politics.

Four years prior, Nascimento arrives at Bangu Penitentiary Complex to quell a riot started by gangleader Beirada, who demands Diogo Fraga, a teacher and human rights activist, to negotiate his conditions.

Nascimento learns that PMERJ commander Formoso plans to dismiss him due to the bad publicity and confronts him in a restaurant, only to be cheered by other diners for his tough line.

Rio de Janeiro's State Secretary for Public Safety Guaracy seizes the opportunity and promotes Nascimento, but transfers Matias to the ordinary police as a scapegoat.

Nascimento expands BOPE's arsenal, personnel, armored vehicles and helicopters, enabling them to eliminate entire drug cartels from favelas, hoping this will reduce police corruption.

However, dirty cops led by Major Rocha form a militia, which eliminates trafficking while extorting money from businesses and building a political machine.

Four years later, disguised militiamen steal rifles from a police station in Tanque, one of the last drug strongholds, giving their corrupt allies a pretext to demand the authorities expel the heavily armed dealers, allowing the militia to take over.

Nascimento listens to phonetaps of dealers and assures Guaracy they are uninvolved; however, corrupt Lieutenant-Colonel Fabio Barbosa claims an informant has implicated them and the raid is authorized.

Matias, returned to BOPE by Rocha, occupies the station and ambushes the fleeing dealers, torturing captured drugleader Pepa to learn where the stolen weapons are.

Musician and actor Seu Jorge (who played Mané Galinha in City of God) was invited by director José Padilha to act as one of the antagonists, Beirada; Maria Ribeiro is also back as Roseane, who is no longer married to Nascimento, but to a left wing Congressman.

Between November and December 2009, before recording for the film started, every actor - except Maria Ribeiro, pregnant at the time - had a training routine, led by Fátima Toledo.

The training helped bring a degree of reality to the film; actors had to learn the proper techniques to handle weapons and also action strategies in risk-zones, besides a strong fitness program, laid heavy on those who weren't in the first movie.

On February 1, recording took place at Morro Dona Marta, in the Botafogo borough, with the use of two helicopters and heavy guns, leading to next-door neighbors thinking it was a real shoot-out.

For the scenes happening at the Bangu 1 prison, forty professionals worked during two months constructing a 500m² detention center, based on notations from art director Tiago Marques about the place, since they didn't get clearance to take pictures of the real building.

After the first film leaked and got in the hands of millions of people before the official release date,[9] the Elite Squad 2 crew created a strategy to avoid the same thing happening to the prequel.

The website's critical consensus states: "Elite Squad: The Enemy Within is a bleak, violent descent into the Brazilian underbelly, ripping into the favelas with unstoppable and kinetic force.