| Description | Character |
|---|
| Ex-Mossad Liaison Officer, now a probationary field agent | |
| Female attorney who has a love/hate relationship with Gibbs | |
| International arms dealer with whom Director Shepard has a mysterious fixation | |
| Criminal profiler who worked as an interrogator in Guantanamo Bay | |
| Also known as the Port-To-Port killer | |
| Junior Field Agent, MIT graduate and student of computer forensics | |
| Female medical examiner in whom Ducky has expressed a romantic interest | |
| Killer of Shannon and Kelly Gibbs | |
| Chief Forensic Specialist, dresses goth but is actually very happy | |
| Daughter of La Grenouille with whom Tony falls in love | |
| Chief Medical Examiner, tells random stories while performing autopsies | |
| Member of NCIS's legal department who has been involved in many cases with Gibbs' team | |
| | Description | Character |
|---|
| Secret Service-turned-Special Agent, shot in the head by a terrorist | |
| Gibbs' first wife, deceased | |
| NCIS Special Agent stationed in Rota, Spain who came to the DC area investigating a serial killer | |
| Ex-CIA, Director of NCIS as of Season 6 | |
| Ziva's half-brother, killed Kate | |
| Senior Field Agent, fond of quoting movies | |
| McGee's little sister who was framed for murder | |
| Ducky's first medical assistant, shot in the shoulder by a terrorist | |
| Gibbs' father who lives in Stillwater, Pennsylvania | |
| FBI Agent and friend of Gibbs, despite having married his second wife | |
| Germaphobic communications specialist that has helped NCIS in several cases involving the Middle East | |
| Ziva's father and Director of Mossad | |
| | Description | Character |
|---|
| Gibbs' daughter, deceased | |
| Mossad agent and love interest of Ziva, shot by Tony | |
| Slippery CIA agent connected to many NCIS cases | |
| Director of NCIS from Season 3-5, ex-lover of Gibbs | |
| Navy drug-detecting German Shepherd whom Abby convinces McGee to adopt | |
| Father of Director Shepard, killed himself | |
| Temporary forensic assistant who tried to frame Tony for murder | |
| Assistant Medical Examiner, rather awkward but very loyal | |
| Leader of the NCIS Major Case Response Team, often called 'Boss' | |
| Gibbs' former boss and mentor who lives in Mexico | |
| Liutenant Colonel with the Army CID who has a lengthy relationship with Gibbs before retiring | |
|
The Simpsons 
Fresh Prince of Bel Air 
Name That Sitcom
