This episode marks the first appearance of two women who become influential in the lives of the main characters:

demonstrates her technical skills by disarming two different bombs during the episode.

(Scottie Thompson): Introduced as Tony DiNozzo's girlfriend. Her presence marks a significant shift in Tony's personal growth, as he begins to show more maturity and focus. Cast & Guest Stars Leroy Jethro Gibbs Mark Harmon NCIS Special Agent in Charge Anthony DiNozzo Michael Weatherly NCIS Special Agent Ziva David Cote de Pablo NCIS Special Agent (Mossad Liaison) Timothy McGee Sean Murray NCIS Special Agent Abby Sciuto Pauley Perrette Forensic Specialist Donald "Ducky" Mallard David McCallum Medical Examiner Hollis Mann Susanna Thompson Army CID Lieutenant Colonel Jeanne Benoit Scottie Thompson Tony’s new girlfriend Mamoun Sharif Enzo Cilenti Terrorist suspect Where to Watch

suffers through another bout of poison ivy while processing the outdoor crime scene. Major Character Introductions

You can stream NCIS Season 4, Episode 7 through the following services:

NCIS must cooperate with the Army's Criminal Investigative Division (CID).

(Susanna Thompson): An Army CID officer who leads the joint investigation alongside Gibbs. Sparks fly between her and Gibbs, establishing a long-term romantic interest.

The seventh episode of , titled " Sandblast ," originally aired on November 7, 2006. It is a key episode that introduces significant recurring characters and focuses on a complex joint investigation between NCIS and the Army. Episode Overview