On tonight’s NCIS: LA season 4, episode 20 “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.
NCIS: LA is a drama about the high-stakes world of a division of NCIS that is charged with apprehending dangerous and elusive criminals that pose a threat to the nation’s security. By assuming false identities and utilizing the most advanced technology, this team of highly-trained agents goes deep undercover, putting their lives on the line in the field to bring down their targets.
The series stars special Agent “G” Callen, who’s known for infiltrating the criminal underworld, and special agent Sam Hanna, G’s partner and a former U.S. Navy SEAL, serving time in both Afghanistan and Iraq. Also Helping the team is Henrietta “Hetty” Lange, the micro-surveillance cameras specialist and overall overseer, special Agent Kensi Blye, Marty Deeks, Tech Operator Eric Beale, and Intelligence Analyst Nell Jones.
NCIS: LA “Purity” airs Tuesday, AApril 5, 9:00PM, EST on CBS. Spoiler pictures below: