Born in an unknown area, Torres was the son of an unnamed man and woman with Lucia Torres being his sister.
When Torres was five years old, his father abandoned the family.
Nicholas Torres joined NCIS originally as a deep-cover agent and would be sent on lone and long assignments due to his specialty.
He has a sister named Lucia Torres, who later joined the Marines and married U.S. Navy Commander George Campbell and have a daughter named Amanda, Torres's niece.
At the start of the series, his undercover assignment was to investigate Leo Silva, an Argentine businessmen allegedly to have built a criminal empire in Argentina, as a police captain in Argentina, while befriending Silva's son David and having a relationship with Silva's daughter Elena.
NCIS Season 14
Six months prior to the start of the season, Torres went "dark" and wasn't giving updates to NCIS because the nature of his assignment just changed. Torres' sister also hasn't heard from him as well and sent a private investigator to find him.
In the beginning, Torres found out that his cover was blown and was forced to kill one of Leo Silva's men to escape.
Silva, however, sent his son to tamper with Lucia's vehicle before Lucia's family went to a Navy event. Torres tried to warn them but was too late as the car exploded and killed his brother-in-law, Commander George Campbell, while his sister and niece survived.
Seeing this, Torres went back to DC to find them, but was tailed by two of Silva's men, and was rescued by both Gibbs and Bishop, before reporting back to Director Vance about Leo Silva and why he had to go dark.
After meeting Lucia and being targeted by Silva using a bomb in a seat, Torres tried to resign and do things on his own, but Gibbs didn't allow him to, instead Gibbs gave him another shot at Silva, who tried to kill a US Judge in a Latino event.
Torres intercepted David and arrested him, while Gibbs rescued the judge and his team securing Silva himself, who finally conceded after knowing Elena turned against him. Torres finally decided to stay in DC, to help with her sister's recovery and to also help her niece; however, Gibbs kept his badge and left it under McGee's old desk, wanting him to be in the team, after seeing what he can do.
In the end of the episode, Torres joined Gibbs' team.
NCIS Season 15
NCIS Season 16
NCIS Season 17
Torres is a highly skilled undercover agent and is one of NCIS's best at this work with the assignments having left him with sixteen different alias and thirty-two addresses.
Torres is also adept at hand-to-hand combat, able to take on two rogue agents on his own before Gibbs and Bishop showed up.
He also demonstrated similar proficiency at hand-to-hand combat earlier, where he managed to kill a would-be assassin with his own knife by redirecting the knife towards him while maintaining enough of a low profile to avoid drawing attention to himself.
As an NCIS Special Agent, Torres is skilled at using a gun to fire lethal or non-lethal shots at a possible suspect or criminal who's posing a risk to Torres himself and his NCIS colleagues.
Unlike his NCIS colleagues who wield a SIG-Sauer P228, Torres uses a Heckler & Koch P2000SK.
For a more detailed list, see Nicholas Torres/List of Appearances.