1The Funky Bunch
Gibbs and Franks investigate the disappearance of a young Marine connected to a mysterious compound with a charismatic leader, and Lala’s fate is revealed.
2Who By Fire
When the body of a college swimmer washes up on the beach, the team must determine if it was an accident or murder. Also, Gibbs prepares for his first interrogation.
3The Edge
Young Ducky is sent to Camp Pendleton to shadow the team while they work a case and, in the process, he reconnects with Gibbs after the two crossed paths years earlier.
4No Man Left Behind
Tensions rise when Franks’ estranged older brother, Mason, blows into town, desperate for help after hitting rock bottom. Also, the team investigates the robbery of a Navy bank while Lala, still struggling after her accident, makes a decision about her future.
5Funny How Time Slips Away (I)
Gibbs and the NIS team investigate the small-town death of a naval officer, but struggle to come up with justice. The crossover continues on NCIS S23E05 Now and Then (II).
6Happy Birthday
When an anonymous tip leads to the discovery of a young Marine’s body at a chilling crime scene, Randy believes it could be connected to a previous case where a coin was left in the victim’s throat. Also, Franks tries to track down priceless packages meant for his brother, Mason.
7Crazy Little Thing Called Love
The team investigates the murder of a Marine who had recently been handpicked for a classified mission. Also, Wheeler’s personal life is upended, Lala is thrown by unexpected news from Vera, and Gibbs and Diane double-date with Randy and his wife.
8End of the Road
When Lala’s favorite CI is shot, the team joins forces with Oceanside PD to determine who was behind the attack. Also, Franks visits his brother Mason at the compound, and Gibbs’ relationship with Diane is tested when she gets a job in Los Angeles.
9Fools Rush In
As the team discovers Gibbs’ drunken Vegas elopement with Diane, the newlyweds contemplate their future. Also, the team investigates a fatal movie theater bombing with a connection to the Pruitt compound where Mason is staying.
10Lean on Me
When a marine captain shows up at Camp Pendleton exhibiting symptoms of a fatal virus, NIS goes on lockdown and Gibbs is forced to take charge. As panic spreads, the team races to determine whether it really is a deadly outbreak or something else entirely.
11Feelin' Alright?
When a lieutenant’s water-logged body is discovered with a potential connection to an international smuggling ring, NIS Panama agents are called in to assist, and Gibbs comes face-to-face with an old nemesis: Special Agent Dwayne Pride. Once the two are assigned to a dangerous undercover mission together, Gibbs must find a way to move on from their past.
12The Gambler
When the NIS Regional Director tries to transfer Mary Jo, she reconnects with an old friend from Atlantic City to help investigate the roadside deaths of two Marines.
13Homeward Bound
When Dr. Tango is arrested for stealing human remains from a national park, Dr. Donald "Ducky" Mallard returns to assist the team in proving his innocence.
14The Beautiful Ballad of Gary Callahan
When the team's trusted K-9 agent, Gary Callahan, is critically wounded at a crime scene, NIS races to track down the culprit while a surprising pre-Pendleton chapter in Franks' life is revealed.
15Johnny B. Goode
Lala’s determination to get Manny out of gang life lands the team in the middle of a turf war.
16Who's Gonna Drive You Home?
While Gibbs and Lala grow closer on a case, Gibbs’ long-distance relationship with Diane is further tested by the arrival of an unexpected guest.
17Rule 13
Wheeler takes command when a car bomb goes off outside NIS headquarters. Also, the truth behind Franks’ distaste for lawyers is revealed.
18Hollywood Ending
With the Camp Pendleton office in danger of being shut down, the team confronts an uncertain future.