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24 Episodes 2012 - 2013
The crime drama's fourth season picks up where Season 3 ended with Callen (Chris O'Donnell) facing the fallout for shooting his archenemy, the Chameleon (Christopher Lambert). He is immediately suspended while the case is investigated, but that's the least of his problems when Iranian hit men kidnap and torture him to obtain information on an Iranian double agent. Meanwhile, Hetty (Linda Hunt) adjusts to retired life, but her time off is short lived. As for Sam (LL Cool J), he helps an Afghan elder, who assisted him years before when he was wounded on a mission, search for the man's missing nephew; and he worries about the safety of his wife Michelle (Aunjanue Ellis) when she is called to resume her former CIA cover as an assassin for international arms dealer Isaak Sidorov (Timothy V. Murphy). Later, Callen and Sam fly to Idaho and join forces with NCIS: Red, a mobile team of agents led by special agent Paris Summerskill (Kim Raver), when a murder weapon found there matches one used in a national-security case in Los Angeles. And just as partners Kensi (Daniela Ruah) and Deeks (Eric Christian Olsen) grow emotionally closer, Hetty shakes up the teams and pairs Kensi with Callen and Deeks with Sam to search for stolen nuclear weapons.
Episode 1
Tue, Sep 25, 2012 60 mins
The fourth season begins with Callen being placed on suspension for the public shooting of the Chameleon. Meanwhile, Hetty adjusts to retired life.
Episode 2
Tue, Oct 2, 2012 60 mins
The body of a retired marine is found at a bomb-making compound in Afghanistan, following a drone strike on the facility. The team investigates to determine why the soldier was there and if he betrayed the U.S.
Episode 3
Tue, Oct 9, 2012 60 mins
The team investigates a compromised Intel operation after four people connected to the classified project are killed when an explosion occurs at a diner.
Episode 4
Tue, Oct 23, 2012 60 mins
The team must determine whether it was an accident or murder when a senatorial candidate's aide is killed while crossing a street.
Episode 5
Tue, Oct 30, 2012 60 mins
Part 1 of 2. A CIA agent who once worked with Sam is found dead of an apparent suicide, but Sam suspects foul play.
Episode 6
Tue, Nov 13, 2012 60 mins
Conclusion. Sam's most private secrets are threatened to be revealed during the continued investigation into the death of a CIA agent who once worked with Sam.
Episode 7
Tue, Nov 20, 2012 60 mins
The team investigates a crime that was posted on the Internet involving a surfer and a dead Navy scientist.
Episode 8
Tue, Nov 27, 2012 60 mins
A retired CIA agent, who was also a millionaire, is murdered. The investigation reveals Hetty may know more about the case than she is willing to acknowledge.
Episode 9
Tue, Dec 11, 2012 60 mins
The team investigates a heist executed by gunmen wearing costumes that could directly impact the U.S. economy. Meanwhile, Kensi isn't thrilled when Granger insists that she join him on a case.
Episode 10
Tue, Dec 18, 2012 60 mins
Callen, Sam, Kensi and Deeks spend Christmas aboard an aircraft carrier investigating the death of a fellow NCIS special agent. Back at headquarters, Nell and Eric enjoy the holiday; and Hetty takes a trip.
Episode 11
Tue, Jan 8, 2013 60 mins
A woman from Deeks' past becomes the target of an international car-stealing operation that is linked to a global terrorist ring. Kensi works undercover at an auto-body shop to investigate the case.
Episode 12
Tue, Jan 15, 2013 60 mins
A marine's distraught widow questions the circumstances surrounding his death in combat, so Sam and Callen investigate to determine if there is a cover-up. Meanwhile, the team fears that Hetty is ordering another brutal evaluation when she brings in a psychologist.
Episode 13
Tue, Jan 29, 2013 60 mins
Callen goes undercover to infiltrate a terrorist group that is recruiting foreign fighters to help carry out an attack in the U.S.
Episode 14
Tue, Feb 5, 2013 60 mins
Callen, Sam, Kensi and Deeks work undercover as an elite tactical force to investigate an ambush that is linked to a drug lord with terrorist connections.
Episode 15
Tue, Feb 19, 2013 60 mins
The team questions the lone survivor of a former terrorist organization to determine whether the group is re-forming.
Episode 16
Tue, Feb 26, 2013 44 mins
Sam helps an Afghan elder, who assisted him years ago when he was wounded on a mission, search for the man's missing nephew.
Episode 17
Tue, Mar 5, 2013 60 mins
Sam's wife is called to resume her former CIA cover when a hit on a Russian mob boss leads the NCIS team to suspect Sidorov.
Episode 18
Tue, Mar 19, 2013 60 mins
Part 1 of 2. Callen and Sam fly to Idaho and join forces with NCIS: Red, a mobile team of agents who live together and investigate crimes in various locations, when a murder weapon found there matches one used in a national security case in Los Angeles.
Episode 19
Tue, Mar 26, 2013 60 mins
Conclusion. Callen and Sam join forces with NCIS: Red, a mobile team of agents who live together and investigate crimes in various locations, to track down a terrorist.
Episode 20
Tue, Apr 9, 2013 60 mins
A Navy lieutenant dies and a pilot is hospitalized after they both drink from a communal water jug that is laced with cyanide. The team investigates to determine whether it is an isolated incident or an early test for large-scale water contamination.
Episode 21
Tue, Apr 23, 2013 60 mins
Kensi and Deeks are sent to Mexico to investigate the theft of a cartel boss's body, after a DEA special task force brings the ruthless criminal down. Back at home, Callen and Sam look into whether there is a leak in the DEA.
Episode 22
Tue, Apr 30, 2013 60 mins
Callen questions Hetty's motives when the team is assigned a missing person's case that involves an undercover agent from her past.
Episode 23
Tue, May 7, 2013 60 mins
Deeks goes undercover to obtain information on a former arms dealer who is seeking to get back in business. In the process, Deeks befriends a female source who takes the investigation in a dangerous direction. Meanwhile, Kensi runs surveillance on Deeks and the woman, and confronts some difficult emotions that surface.
Episode 24
Tue, May 14, 2013 60 mins
The fourth season ends with a nuclear explosion in the Pacific. The event reignites a search for stolen nuclear weapons, and leads Hetty to shuffle partnerships. She sends Callen and Kensi overseas and leaves Sam and Deeks as a stateside team.