| NCIS | |
|---|---|
| Season 4 | |
 Season 4 U.S. DVD cover | |
| Starring | |
| No. of episodes | 24 |
| Release | |
| Original network | CBS |
| Original release | September 19, 2006 – May 22, 2007 |
| Season chronology | |
The fourth season of the police procedural drama NCIS was originally broadcast between September 19, 2006, and May 22, 2007. Special Agent Leroy Jethro Gibbs left NCIS at the end of season three after a terrorist attack had been successful because his superiors did not heed his warnings in time. The team is now led by Anthony DiNozzo 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 and mentor Mike Franks, both as recurring characters. Also, albeit later in the season, Army CID Lieutenant Colonel Hollis Mann is introduced as another love interest for Gibbs.
In December 2006, Bill Keveney from USA Today announced that the "CBS investigative drama NCIS topped the Nielsen viewership list for the first time with 17.4 million. CBS was the No. 1 network in viewers and young adults (ages 18 to 49) for the week of Dec. 11–17."[1]
TV Guide reported on May 5, 2007, that creator and showrunner Donald Bellisario would step down and leave the series due to a disagreement with series star Mark Harmon.[2] Because of Bellisario's "chaotic management style", Harmon threatened to leave NCIS.[3] Co-executive producer Chas. Floyd Johnson and head writer Shane Brennan replaced Bellisario as showrunner.[2]
- ^ Keveney, Bill (December 20, 2006). "'NCIS' gets rerun assist". USA Today. Archived from the original on April 4, 2015. Retrieved June 3, 2013.
- ^ a b Ausiello, Michael (May 5, 2007). "Exclusive: NCIS Boss Exits!". TV Guide. Archived from the original on March 11, 2009. Retrieved November 12, 2012.
- ^ Ausiello, Michael (April 24, 2007). "Exclusive: NCIS Feud Erupts! Harmon to Walk?". TV Guide. Archived from the original on July 5, 2012. Retrieved November 12, 2012.