Episode:LD50

Episode

Credits

Transcript

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First aired

February 2, 2010

Written by

Speed Weed and R. Scott Gemmill

Directed by

Jonathan Frakes

LD50 is the fourteenth episode of NCIS: Los Angeles.

Synopsis

The body of a career criminal posing as a Marine is discovered, prompting OSP to investigate. They soon discover that a biochemical weapons expert suffering from Alzheimer's disease was tricked into producing a deadly toxin for an arms dealer. The team soon realize that there will be an auction at which the weapon will be sold and race against the clock to stop international terrorists from buying the weapon which could be used to launch a bio-terror attack against Los Angeles.

Episode Name Origin

The name "LD50" refers to the deadly substance around which the episode revolves.

Cast

Series Regulars

Actor/Actress	Character	Role
Chris O'Donnell	G. Callen	Special Agent
LL Cool J	Sam Hanna	Special Agent
Linda Hunt	Henrietta Lange	Operations Manager
Peter Cambor	Nate Getz	Operational Psychologist
Daniela Ruah	Kensi Blye	Special Agent
Adam Jamal Craig	Dominic Vail	Special Agent
Current Status: Missing in Action

Recurring Guests

Actor/Actress	Character	Role
Barrett Foa	Eric Beale	Tech Operator
JR Bourne	Dallas	Head of the local crime syndicate who previously appeared in 'Breach'

Other Cast

Character	Actor	Role
Esther Balmore	Julianna McCarthy	Former expert on the development of toxins, now suffering from Alzheimer's
Gage Jenson	Dameon Clarke
Simon Amputuan	Played by Burt Bulos	Filipino arms dealer detained by NCIS
Jacobus Troyger	Played by Andrew Connolly	Arms dealer responsible for the auction at which the Clostridium botulinum was sold
Blond Man	Played by Bru Muller
Sadiki Hassan	Played by Vachik Mangassarian	Egyptian arms dealer present at the auction

Real World Connections

Lethal Dose, 50% or LD 50, is one the measures used to indicate the dose of radiation or of a toxic substance required to kill half the members of a tested population. Other measures used to indicate the dosage include LC50 (Lethal Concentration, 50%) or LCt50 (Lethal Concentration & Time).