Part 1 of 2. Callen and Sam fly to Idaho and join forces with NCIS: Red, a mobile team of agents who live together and investigate crimes in various locations, when a murder weapon found there matches one used in a national security case in Los Angeles.
A Navy lieutenant dies and a pilot is hospitalized after they both drink from a communal water jug that is laced with cyanide. The team investigates to determine whether it is an isolated incident or an early test for large-scale water contamination.
Deeks goes undercover to obtain information on a former arms dealer who is seeking to get back in business. In the process, Deeks befriends a female source who takes the investigation in a dangerous direction. Meanwhile, Kensi runs surveillance on Deeks an (more…)
The fourth season ends with a nuclear explosion in the Pacific. The event reignites a search for stolen nuclear weapons, and leads Hetty to shuffle partnerships. She sends Callen and Kensi overseas and leaves Sam and Deeks as a stateside team.
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- Premiered: September 22, 2009
- Rating: TV-14
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- Premise: An "NCIS" spin-off following the undercover agents of the NCIS Office of Special Projects, working from a Spanish mission headquarters in Los Angeles. (more)