Anthony "Tony" D. DiNozzo Jr., (or "Junior" by his father, Anthony DiNozzo Senior or Very Special Agent Anthony DiNozzo) was the Senior Field Agent on the NCIS Major Case Response Team led by Leroy Jethro Gibbs with Tony also serving as the second-in-command of the team.
In rare occasions where Gibbs was usually absent or elsewhere, Tony automatically became the temporary leader of the team.
After being with NCIS for fifteen years, having first joined the agency in 2001, Tony resigned from NCIS for good in May 2016 to care for his daughter, Tali.
Born in an unknown state, presumably New York, DiNozzo was the son of wealthy businessman Anthony DiNozzo Senior and an unnamed woman with the family residing in Long Island, New York and also harboring some wealth although the degree of wealth they had was never revealed.
At the age of five, young DiNozzo endured nightmares about vampires due to his mother going through a phase involving Louis XV that inspired the decor of his room.
During his childhood, DiNozzo also owned some Sea Monkeys until his mother accidentally drank them, having confused their sea castles with her mint julep.
Due to the fact that his father was a Civil War re-enactor, young Tony was forced to carry the poop bucket during scenes, causing the other re-enactors to call Tony "their little poo boy".
Presumably at some point, DiNozzo's mother who may have been an alcoholic like her husband subsequently died and this triggered DiNozzo's own miserable childhood as he was left behind in a hotel room at one point.
DiNozzo Senior would later remarry, choosing various women who would become young Tony's stepmothers with Tony having no positive or pleasant memories of any of them.
At some point, DiNozzo as a teenager was shipped off to boarding school.
After finishing either boarding school or high school, DiNozzo then attended Rhode Island Military Academy.
He later attended Ohio State University, graduating with a Bachelor of Arts degree in Physical Education.
During his time at Ohio State, he was on the varsity basketball team and made it to the Final Four before losing to UCLA. He later participated in a football game leading a team against one from Michigan that was led by Brad Pitt. Tony broke his leg during the game which was revealed to have been broken by Brad alone.
At some point, Tony was also in the Ohio State Alpha Chi Delta class of 1989. He also received a combined score of 950 on his SATs.
While in Ohio State, Tony saw a townhouse on fire and rushed inside, finding a young boy inside a closest.
As Tony carried the boy out of the building, the boy mentioned his sister, Amber and as Tony attempted to save Amber, a part of the ceiling fell in front of him and as such, Tony decided to leave Amber and save the boy instead.
It was later revealed that Tony had a choice: save the boy or risk their lives to save Amber. Tony ultimately choosing to flee the building with the boy in tow.
The young boy, still resenting Tony for refusing to save his sister later grew up and also got a job at the Baltimore Arson Unit and didn't meet Tony until the Season 9 episode, Rekindled (episode) and as such, this event was what later prompted Tony to become a Detective.
Upon becoming a Detective, Tony spent two years in Peoria and Philadelphia before moving to Baltimore which was revealed in the Season 1 episode, High Seas (episode).
While at Baltimore, Tony ran into his future boss: Leroy Jethro Gibbs and the two sides worked together on a money laundering case.
Tony eventually discovered that his partner, Danny Price was a dirty cop which ultimately prompted Tony to resign from Baltimore PD for good and join NCIS instead, Gibbs having suggested it to him earlier.
Tony eventually joined NCIS and presumably began as an NCIS Probationary Agent before eventually being promoted to the rank of Senior Special Agent of the team.
JAG Season 8
Tony made his debut appearance in the JAG Season 8/NCIS backdoor pilot episode, Ice Queen (episode) where at the time of his introduction, he was the Senior Special Agent of the main NCIS Major Case Response Team led by NCIS Special Agent Leroy Jethro Gibbs which also included Agent Vivian Blackadder, Dr. Donald Mallard and Forensic Scientist Abigail Sciuto.
NCIS Season 1
NCIS Season 2
NCIS Season 3
NCIS Season 4
NCIS Season 5
NCIS Season 6
NCIS Season 7
NCIS Season 8
NCIS Season 9
NCIS Season 10
NCIS Season 11
NCIS: New Orleans Season 1
NCIS Season 12
NCIS: Los Angeles Season 7
NCIS Season 13
Prior to joining NCIS, Tony worked as a Police Detective in Peoria and Philadelphia as well as Baltimore but upon discovering that his Baltimore partner was in fact corrupt, Tony chose to resign from the Baltimore Police Department force for good and join NCIS instead which occurred in 2001.
Presumably, after a few months, Tony was promoted from Probationary Agent to NCIS Special Agent before becoming Senior Special Agent of the main NCIS team, a rank he held up until his resignation from the team in May 2016.
As an NCIS Special Agent and also the Senior Agent of the Major Case Response Team, Tony was one of the most skilled Agents associated with NCIS in general.
He was trained to process crime scenes and interrogate any possible suspects too.
He was also extremely skilled in undercover work as evident by former NCIS Director Jenny Shepard choosing him for an undercover operation that lasted for most of NCIS Season 4.
Like Gibbs, DiNozzo was old school in terms of using traditional methods to solve a case but in recent years, DiNozzo had also begun using technology as well.
Tony's specialty was going undercover and he was so skilled at it that Gibbs regarded Tony as a "born operator".
This skill which had been honed to perfection enabled Tony to go undercover many times, especially if it required getting information about a suspect or person of interest in a case that the team were investigating without tipping off the suspects themselves, examples are in the Season 1 episode, Split Decision (episode) where he posed as a rogue weapons-dealer, unknowingly uncovering an Alcohol, Tobacco and Firearms operation in the process and in the Season 2 episode, Chained (episode) where while disguised as a prisoner, Tony befriended an escaped convict named Jeffrey White who had information on stolen Iraqi antiques.
His undercover skills were so good that Director Jenny Shepard chose him to help her with a top-secret undercover operation concerning her personal enemy, the Frog.
Tony was fluent in Spanish and Italian.
While in Shanghai, China, he also displayed some fluency in Mandarin Chinese.
Like all NCIS Special Agents, Tony was trained in the use of a firearm with his primary weapon of choice being a SIG-Sauer P228.
Tony was skilled at interrogating various suspects that the NCIS team come across. He was always seen interrogating suspects usually by himself or alongside Gibbs, McGee, Ziva and Bishop.
Tony was skilled in lock-picking.
Relationships with Family Members
Anthony DiNozzo Senior
Relationships with Women
During the case investigating the murder of his colleague, fellow NCIS Special Agent Chris Pacci, Tony met and subsequently befriended Amanda Reed with the two beginning a relationship.
Unfortunately, any hopes for a good relationship were permanently extinguished when Tony learnt that Reed was in fact Lieutenant Commander Hamilton Voss and also the one responsible for killing Pacci which left Tony stunned.
Upon being discovered, Reed attempted to escape but Gibbs cornered and shot her dead, avenging Pacci.
For a time, Tony dated a social worker named Michelle.
The relationship ended, prompting Michelle to break into Tony's apartment and fill his closet with dog crap.
Dr. Jeanne Benoit
Leroy Jethro Gibbs
Abigail "Abby" Sciuto
Vivian "Viv" Blackadder
At the time she joined NCIS, Viv who was also Tony's partner was still struggling to come to terms with the murder of her brother, Rex.
In the field, the two worked well together and had a sibling relationship although like Gibbs, Tony was left concerned by Viv's constant need for revenge against the terrorist who had carried out the USS Cole bombing.
It's presumed that after Viv blew the anti-terror operation in Rota, Spain, Tony stopped speaking to her for good and also subsequently cut off any kind of communication with her as well, presumably because he was angry at her for knowingly jeopardizing the operation or putting Gibbs's life in danger or maybe because he felt she was too far gone to be reasoned with.
Caitlin "Kate" Todd
Timothy "Tim" McGee
Jennifer "Jenny" Shepard
Eleanor "Ellie" Bishop
Relationships with other agents from various federal agencies
Stanley "Stan" Burley
- Former FBI Special Agent-turned-NCIS Special Agent Vivian Blackadder- served as DiNozzo's partner during the JAG Season 8/NCIS backdoor pilot episodes, Ice Queen (episode) and Meltdown (episode). Current fate unknown although it's presumed that she was fired from NCIS in disgrace or returned to the FBI by mutual consent in the aftermath of jeopardizing an anti-terrorism operation in Rota, Spain.
- Former Secret Service Agent-turned-NCIS Special Agent Caitlin Todd- Served as DiNozzo's partner for two years which occurred during NCIS Seasons 1 and 2. Was later shot dead by double agent/mole and terrorist, Ari Haswari during the Season 2 finale episode, Twilight (episode).
- Former Mossad Officer-turned-NCIS/Mossad Liaison Officer-turned-NCIS Probationary/NCIS Special Agent Ziva David- Served as DiNozzo's partner for eight years which took place during NCIS Seasons 3, 4, 5, 6, 7, 8, 9 and 10. Later resigned from NCIS for good at the beginning of Season 11 and two years, was revealed to have died in a mortar attack on the farmhouse where she lived.
- Former NSA Analyst-turned-NCIS Probationary Agent Eleanor Bishop- DiNozzo's fourth and final partner. Served as DiNozzo's partner for nearly three years up until DiNozzo's own resignation from NCIS in the Season 13 finale episode, Family First (episode).