Purity (episode)

Purity is the 20th episode of NCIS: Los Angeles Season 4 as well as the 92nd episode of the entire NCIS: Los Angeles series.
==Synopsis==
OSP investigate when two Naval officers die from from cyanide poisoning after drinking water from the same jug with the team wondering if the incident was isolated or a test for something much more deadlier.
==Plot==
==Cast==
===Series Regulars===
Name 	Portrayed by 	Role
G. Callen 	Chris O'Donnell 	NCIS Special Agent and the leader of the Office of Special Projects field team.
Kensi Blye 	Daniela Ruah 	NCIS Special Agent with the Office of Special Projects.
Marty Deeks 	Eric Christian Olsen	A Detective with the Los Angeles Police Department and also the LAPD/NCIS liaison.
Eric Beale 	Barrett Foa 	Tech Operator with the Office of Special Projects.
Nell Jones 	Renée Felice Smith 	Tech Analyst for the Office of Special Projects.
Henrietta Lange	Linda Hunt 	Operations Manager with the Office of Special Projects.
Sam Hanna 	LL Cool J 	A former Navy SEAL-turned-NCIS Special Agent with the Office of Special Projects.
===Recurring Cast===
Name 	Portrayed by 	Role
News Reporter	Kent Schocknek 	Reporter.
Crawford 	Travis Aaron Wade	Chief Petty Officer in the United States Navy.
===Guest Cast===
Name 	Portrayed by 	Role
Lawrence De Vries 	Tom Gallop 	
Dominic Fryman 	Chris Bruno 	Alex Fryman's father.
Alex Fryman 	Owen Teague 	Dominic Fryman's son.
Randall Baker 	Jay Ellis 	Flight Officer in the United States Navy.
Joshua Gordon 	Jade Carter 	Lieutenant in the United States Navy.
Zaki Faheem 	Omar Elba 	
Cam 	Steven W. Bailey 	
Lopez 	Mark Damon Espinoza	Detective with the Los Angeles Police Department.
Ashley Hong 	Lily Mariye 	
Roger Morgan 	Steve Tom 	
Eugene 	Rance Howard 	
Alessandra 	Bree Condon 	
EMT Driver (Purity)	Oscar Magana Jr. 	
Water Vendor 	Wade Greene 	
  v - [ e] - dNCIS: Los Angeles Season 4
♦ Endgame (NCIS: Los Angeles episode) ♦ Recruit (episode) ♦ The Fifth Man (episode) ♦ Dead Body Politic (episode) ♦ Out of the Past (episode) ♦ Rude Awakenings (episode) ♦ Skin Deep (episode) ♦ Collateral (episode) ♦ The Gold Standard (episode) ♦ Free Ride (episode) ♦ Drive (episode) ♦ Paper Soldiers (episode) ♦ The Chosen One (episode) ♦ Kill House (episode) ♦ History (episode) ♦ Lokhay (episode) ♦ Wanted (episode) ♦ Red Part 1 (episode) ♦ Red Part 2 (episode) ♦ Purity (episode) ♦ Resurrection (episode) ♦ Raven and The Swans (episode) ♦ Parley (episode) ♦ Descent (episode)
Category:NCIS: Los Angeles Episodes
Category:NCIS: Los Angeles Season 4 Episodes
Category:NCIS: Los Angeles Episodes written by Joe Sachs
Category:NCIS: Los Angeles Episodes directed by Eric Laneuville