Gibbs undergoes physical and emotional changes as he returns to NCIS. While fighting terrorism and murder, team members make life-changing decisions.

1. Stop the Bleeding 44m With Gibbs recovering on a naval ship, Tony and CIA officer Joanna Teague join forces in Shanghai to take down The Calling before war breaks out.

2. Personal Day 43m Gibbs returns to NCIS with a new look that intrigues the team. His first case back partners him with a DEA agent with whom he has some shared history.

3. Incognito 43m A Quantico Marine is murdered after contacting Gibbs about a case. McGee and Bishop go undercover as a couple to keep tabs on a suspect and his wife.

4. Double Trouble 41m Director Vance goes back into the field with Gibbs to investigate a murder that leads back to one of Vance's old cases involving an NCIS officer.

5. Lockdown 43m While visiting a pharmaceutical company's lab to consult on a murder case, Abby is trapped inside when armed men break in and take employees hostage.

6. Viral 44m While McGee and Delilah take the next step in their relationship, the team investigates a series of murders that may be the work of a copycat killer.

7. 16 Years 44m The team helps Ducky's cold case club investigate whether the son of a recently murdered ex-naval officer was wrongly convicted of murder years ago.

8. Saviora 43m Tony and McGee search South Sudan for volunteer doctors who've gone missing, including the husband of Tony's ex-girlfriend. Gibbs has a setback.

9. Day in Court 44m When a petty officer accused of murdering his ex is freed in a mistrial, he begs NCIS to find the real killer. Bishop discovers something unsettling.

10. Blood Brothers 44m At Thanksgiving, Bishop goes home to Oklahoma while the team work on holiday plans and try to solve a case involving forgery, murder and leukemia.

11. Spinning Wheel 44m Following an attack, Ducky relates the story of his decades-old search for his half-brother. Back at NCIS, Bishop makes a decision about her marriage.

12. Sister City (Part 1) 41m Gibbs works with New Orleans's local NCIS unit to find Abby's missing brother. [Story concludes on "NCIS: New Orleans,” Season 2, Episode 12.]

13. Déjà Vu 40m During freezing weather, a seaman set to testify against a human trafficking ring is murdered, forcing NCIS to race the clock to find other victims.

14. Decompressed 41m When a man suddenly dies after attacking three co-workers inside a pressurized chamber, NCIS must solve the case -- but only from outside the chamber.

15. React 40m After the Secretary of the Navy's daughter is kidnapped for ransom, she brings in Gibbs and the team, who discover the case is more than it appears.

16. Loose Canon 43m Gibbs lets Dr. Taft join him after a suspect in a munitions robbery dies on his operating table. Ducky's autopsy links the suspect to an old NCIS foe.

17. After Hours 41m A case that's too open and shut nags at everyone on the team, leading each of them to ruin their evening by revisiting different aspects of the crime.

18. Scope 43m Gibbs bonds with a Marine who's the only survivor of an Iraq sniper attack. Forensic evidence leads Abby to the sniper's real mission closer to home.

19. Reasonable Doubts 43m The wife and mistress of a Navy public affairs officer each claims to have witnessed the other murdering the man. Tony's dad has a strange encounter.

20. Charade 41m Tony stumbles upon the case of his own stolen identity when he's handed an envelope of cash by a senator, who's being blackmailed by "Tony DiNozzo."

21. Return to Sender 41m Gibbs and Fornell help former NCIS director Morrow find an ex-intelligence officer who escaped a British prison and was smuggled back into the U.S.

22. Homefront 41m Gibbs and Fornell look for an assassin. After the teenage son of a deployed Marine shoots and wounds an intruder, Gibbs learns the boy was the target.

23. Dead Letter 41m With Fornell in crisis, Gibbs, Monroe and MI-6 agent Reeves focus on Jacob's story. Abby finds a link to Kort. Gibbs' hunch may lead back to Ziva.