While the procedural elements remained, viewers noted a darker, more somber tone as the "family" at NCIS faced internal and external threats they couldn't simply solve in an hour.

The season leaned heavily into character backstories, featuring notable appearances by Anthony DiNozzo Sr. (Robert Wagner) and the introduction of Admiral John McGee (Jamey Sheridan), Timothy McGee's estranged father.

Season Finale: The core trio resigns; Gibbs is seen aiming a sniper rifle at Fornell.

The mid-season double-header, " Shabbat Shalom " and " Shiva ," is the emotional core of the year. The assassination of Ziva’s father, Eli David, and Director Vance’s wife, Jackie, sent the team into a season-long spiral of vengeance.

Critics and fans alike praised Cote de Pablo for her performance in the "Shiva" arc, citing it as some of the series' best acting.

This season solidified Brian Dietzen (Jimmy Palmer) as a series regular after nine years on the show. Every Major NCIS Guest Star Ever - TV Guide

The final episodes introduced DOD investigator Richard Parsons (Colin Hanks), who targeted Gibbs for his past "off-book" actions. This culminated in a massive cliffhanger where Tony, Ziva, and McGee resigned to protect Gibbs. Major Performance Milestones

Season Premiere: The team hunts Harper Dearing after the Navy Yard bombing.