: The "release group" name, a well-known entity in the TV scene.
: Indicates the file was distributed or indexed by the ETTV community. Cast & Credits G. Callen Chris O'Donnell Sam Hanna Kensi Blye Daniela Ruah Marty Deeks Eric Christian Olsen Hetty Lange Linda Hunt Director Eric Laneuville Writer NCIS: Los Angeles Season 4 Episode 20 Recap: Purity NCIS Los Angeles S04E20 HDTV x264-LOL[ettv]
: Callen goes undercover by attending a DNA rally, where he stages a fight with Sam to gain the group's trust. : The "release group" name, a well-known entity
: Callen’s cover is blown, and he is nearly killed by cyanide himself, only surviving by using a counteragent. The team eventually locates the group's base and prevents the mass poisoning. Technical File Details Callen Chris O'Donnell Sam Hanna Kensi Blye Daniela
In this episode, the OSP (Office of Special Projects) team investigates a potentially catastrophic chemical threat in Los Angeles.
The specific naming convention in your query provides information about the digital release of this episode: : Sourced from a high-definition television broadcast.
: The team discovers the incident was a "trial run" by a radical protest group called "Designing a New America" (DNA). The group plans to release cyanide into the city's water supply to make a political statement.