Season 1, Episode 24
In the first-season finale, Callen has something personal at stake in his search for a woman who not only knows the location of a fortune to be used to fund a war in the Middle East, but clues to Callen's unknown past.
Season 1, Episode 23
Callen's cover is blown and he must sever his ties with NCIS to protect the team, while the team investigates the security leak.
Season 1, Episode 22
The team hunts a terrorist who escaped while in Army custody during a secret transfer in Los Angeles.
Season 1, Episode 21
Months after Dom's abduction, the team receives video evidence that he's being held hostage, and they race to rescue him.
Season 1, Episode 20
The murder of a Navy officer is connected to a prominent socialite, and the team investigates with the help of LAPD liaison Marty Deeks (Eric Christian Olsen).
When the murder of a Marine is connected to a mixed-martial-arts gym, Sam goes undercover as a fighter. Several MMA fighters have cameos, including Dan Henderson, Frank Shamrock, Gilbert Melendez, Josh Thomson, K.J. Noons, and Cung Le.
The team investigates the death of a Marine in a drive-by shooting, and they believe that the victim's brother may be the next target.
The team investigates the death of a sailor who died in an underground street race, and they find that his car was sabotaged.
Season 1, Episode 16
The team suspects that the death of a naval officer ruled as a suicide could be a murder, and that the crime implies a threat to national security.
Kensi is shot while in a bank during a robbery by three armed criminals who hold hostages.
Season 1, Episode 14
A national-security threat is discovered when the bodies of two criminals posing as marines are found at a site where a deadly toxin was made.
Season 1, Episode 13
The team responds to an "agent-needs-assistance" page and discovers at the crime scene that one of their own is in danger.
Season 1, Episode 12
Callen goes undercover as an old alias from his past to investigate the murder of a recently released convict.
Season 1, Episode 11
The case of a murdered petty officer leads Sam to a teen he knows and suspects may have a connection with terrorists.
Season 1, Episode 10
When a Marine is killed by an exploding cell phone, the team investigates his former unit, which specializes in explosives, to see if its members are suspects or potential victims.
Abby Sciuto (Pauley Perrette) joins the Los Angeles team to investigate a chief petty officer's murder that matches the pattern of a serial killer Abby is tracking.
Season 1, Episode 8
The case of a murdered marine leads to a volatile militia group and a stolen missile, and the team must work without Hetty, who is in Washington, D.C., attending a Senate hearing.
Season 1, Episode 7
The case of a murdered Russian woman leads to evidence that could answer questions about why Callen was gunned down.
The investigation into the death of a marine who fell from a rooftop during a party reveals that the man was living a double life.
Season 1, Episode 5
A defense contractor is killed, and the team fears that his classified-software secrets are lost until they find a suspect, whom they also discover is connected to Vance's past. Abby Sciuto: Pauley Perrette.
The team searches for a former Marine who murdered an Iraqi businessman he had been hired to protect.
Hanna has conflicted emotions in the case of a murdered drug dealer when he learns his Navy Seal comrades are involved.
In the premiere of the NCIS spin-off, NCIS: Los Angeles, the action picks up four months after Special Agent G. Callen (Chris O'Donnell) was shot. Callen rejoins the Agent Hanna (LL Cool J) and the rest of the team to investigate a drug cartel that is believed to be involved in the kidnapping and murder of one of the boys in white. Plus, Hetty (Linda Hunt) tries to get to the bottom of what exactly the "G" in Callen's name stands for.
Don't forget to read our season preview on how the show will distinguish itself from its parent show. Then, share your thoughts on the season premiere in the space after the jump.