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
suffers through another bout of poison ivy while processing the outdoor crime scene. Major Character Introductions Watch NCIS S04E (7)
(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