History is the 15th episode of NCIS: Los Angeles Season 4 as well as the 87th episode of the entire NCIS: Los Angeles series.
Synopsis
OSP investigate the death of a former member of a domestic terrorist group, the Gun Barrel Party, a group that in the 1970s was wanted for carrying out a string of bombings as well as domestic terrorism with the investigation growing intense when it's discovered that a supposedly dead member of the Gun Barrel Party may in fact still be alive and living under an alias in downtown Los Angeles.
Plot

Deeks in Ops.
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. |
Other Cast
Name | Portrayed by | Role |
---|---|---|
Oliver Johnson | Richard Cox (actor) | Member of the Gun Barrel Party who is using the alias "Roy Hale". |
Jim Mullins | Tim de Zarn | Member of the Gun Barrel Party. |
Leah Dewhurst | Sylva Kelegian | |
David Thompson | Jared Hillman | Professor Roy Hale's TA or Teaching Assistant. |
Alan Sanderson | Hartley Sawyer | Member of Red Tide. |
Ellen | Ciera Payton | |
Brad Ross | Regan Burns | |
Jeff | Landon Ashworth |