NCIS: Los Angeles 2009 | TV Show

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An "NCIS" spin-off following the undercover agents of the NCIS Office of Special Projects, working from a Spanish mission headquarters in Los Angeles.

Premiered: September 22, 2009

Rating: TV-14

User Rating:4.45 out of 5 (1,026 ratings)

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Season 4, Episode 20 Purity

First Aired: April 9, 2013

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.

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Red: Part Two

Season 4, Episode 19

March 26, 2013

Next Episode

Resurrection

Season 4, Episode 21

April 23, 2013

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