This is a list of episodes for the fourth season of the police procedural

Police procedural

The police procedural is a subgenre of detective fiction which attempts to convincingly depict the activities of a police force as they investigate crimes. While traditional detective novels usually concentrate on a single crime, police procedurals frequently depict investigations into several...

 drama

Drama

Drama is the specific mode of fiction represented in performance. The term comes from a Greek word meaning "action" , which is derived from "to do","to act" . The enactment of drama in theatre, performed by actors on a stage before an audience, presupposes collaborative modes of production and a...

 NCIS

NCIS (TV series)

NCIS, formerly known as NCIS: Naval Criminal Investigative Service, is an American police procedural drama television series revolving around a fictional team of special agents from the Naval Criminal Investigative Service, which conducts criminal investigations involving the U.S...

. The fourth season of NCIS was originally broadcast between September 19, 2006 and May 22, 2007. Special Agent Gibbs

Leroy Jethro Gibbs

Leroy Jethro Gibbs is a fictional character and the main protagonist of the CBS TV series NCIS. He is portrayed by Mark Harmon.-Background:...

 left NCIS at the end of season 3 after a terrorist attack had been successful because his superiors did not heed his warnings in time. The team is now led by DiNozzo

Anthony DiNozzo

Anthony "Tony" D. DiNozzo Jr. is a fictional character from the CBS TV series NCIS. He is portrayed by Michael Weatherly.-Background:Tony comes from a wealthy family from Long Island, New York. He is an only child, but has been cut off from his family's fortune. His mother, maiden name Paddington,...

 for a short time until Gibbs' eventual return. New characters introduced in this season are Michelle Lee, who was briefly on DiNozzo's team and was transferred to the legal department upon Gibbs' return, and (already in the final episodes of season 3) Gibbs' former boss & mentor Mike Franks, both as recurring characters. Also, albeit later in the season, Army CID

U.S. Army Criminal Investigation Command

United States Army Criminal Investigation Command investigates felony crimes and serious violations of military law within the United States Army...

 Lieutenant Colonel Hollis Mann is introduced as another love interest for Gibbs.

Cast

Character	Portrayed by	Main cast	Recurring cast
Leroy Jethro Gibbs Leroy Jethro Gibbs Leroy Jethro Gibbs is a fictional character and the main protagonist of the CBS TV series NCIS. He is portrayed by Mark Harmon.-Background:...	Mark Harmon Mark Harmon Mark Harmon is an American actor who has been starring in American television programs and films since the mid-1970s, after a career as a collegiate football player with the UCLA Bruins. Since 2003, Harmon has starred as Leroy Jethro Gibbs in the CBS series NCIS.-Early life:Harmon was born Thomas...	entire season
Anthony DiNozzo Anthony DiNozzo Anthony "Tony" D. DiNozzo Jr. is a fictional character from the CBS TV series NCIS. He is portrayed by Michael Weatherly.-Background:Tony comes from a wealthy family from Long Island, New York. He is an only child, but has been cut off from his family's fortune. His mother, maiden name Paddington,...	Michael Weatherly Michael Weatherly Michael Manning Weatherly, Jr. is an American actor, best known for his roles as Special Agent Anthony DiNozzo on the television series NCIS, and Logan Cale on the television series Dark Angel.-Early life:...	entire season
Ziva David Ziva David Ziva David is a fictional character from the NCIS television series by CBS Television, portrayed by Chilean actress Coté de Pablo....	Cote de Pablo Cote de Pablo María José de Pablo Fernández, better known as Coté de Pablo , is a Chilean-American actress and recording artist. De Pablo has won an ALMA Award for her role as NCIS Special Agent Ziva David in the television series NCIS...	entire season
Abby Sciuto Abby Sciuto Abigail "Abby" Sciuto is a fictional character from the NCIS television series by CBS Television, and is portrayed by Pauley Perrette. Like Jethro Gibbs, Anthony DiNozzo and Donald Mallard, Abby was first introduced in the episodes "Ice Queen" and "Meltdown" in the television show JAG, and has...	Pauley Perrette Pauley Perrette Pauley Perrette is an American actress, best known for playing Abby Sciuto[p] on the U.S. TV series NCIS, a role that has made her the most popular actress on U.S. primetime television. She is also a published writer, a singer and civil rights advocate.-Early life:Perrette was born in New Orleans...	entire season
Timothy McGee Timothy McGee Timothy "Tim" McGee is a fictional character from the CBS television series NCIS. He is portrayed by Sean Murray. Timothy McGee is a special agent investigating crime in this police procedural show...	Sean Murray	entire season
Jennifer Shepard	Lauren Holly Lauren Holly Lauren Michael Holly is an American actress. She is known for her roles as Deputy Sheriff Maxine Stewart in the TV series Picket Fences, as Mary Swanson in the 1994 film Dumb & Dumber, and as Jenny Shepard on the TV series NCIS. She was married to comic actor Jim Carrey from 1996 to...	entire season
Donald 'Ducky' Mallard	David McCallum David McCallum David Keith McCallum, Jr. is a Scottish actor and musician. He is best known for his roles as Illya Kuryakin, a Russian-born secret agent, in the 1960s television series The Man from U.N.C.L.E., as interdimensional operative Steel in Sapphire & Steel, and Dr...	entire season
Jimmy Palmer	Brian Dietzen Brian Dietzen Brian Dietzen is an American actor who has played the supporting role of Jimmy Palmer on NCIS since 2004.-Early life:Dietzen was born in Colorado...		entire season

Episodes

No. in series		|Title		|Written by		|U.S. viewers (millions)

Special Features on DVD

• Cast and Crew Commentaries on Select Episodes
• Cast Roundtable (Parts 1 & 2)
• Ducky's World
• Behind the Set: The Production Design of N.C.I.S.
• Dressed to Kill: Dressing the Sets of N.C.I.S.
• Prop Master
• Picture Perfect: The Looks of N.C.I.S.
• Season of Secrets