NCIS: Los Angeles: 4x20
Purity
When cyanide in a communal water jug lethally poisons a lieutenant and leaves a Navy pilot in serious condition, the NCIS: LA team investigates whether this is an isolated incident or an early test for large-scale water contamination.
4 - 1Endgame Sep. 25, 2012
4 - 2The Recruit Oct. 02, 2012
4 - 3The Fifth Man Oct. 09, 2012
4 - 4Dead Body Politic Oct. 23, 2012
4 - 5Out of the Past (1) Oct. 30, 2012
4 - 6Rude Awakenings (2) Nov. 13, 2012
4 - 7Skin Deep Nov. 20, 2012
4 - 8Collateral Damage Nov. 27, 2012
4 - 9The Gold Standard Dec. 11, 2012
4 - 10Free Ride Dec. 18, 2012
4 - 11Drive Jan. 08, 2013
4 - 12Paper Soldiers Jan. 15, 2013
4 - 13The Chosen One Jan. 29, 2013
4 - 14Kill House Feb. 05, 2013
4 - 15History Feb. 19, 2013
4 - 16Lohkay Feb. 26, 2013
4 - 17Wanted Mar. 05, 2013
4 - 18Red (1) Mar. 19, 2013
4 - 19Red (2) Mar. 26, 2013
4 - 20Purity Apr. 09, 2013
4 - 21Resurrection Apr. 23, 2013
4 - 22Raven & the Swans Apr. 30, 2013
4 - 23Parley May. 07, 2013
4 - 24Descent May. 14, 2013