NCIS stands for Naval Criminal Investigative Service. The series chronicles the operations of an elite team of special agents whose mission is to investigate any crime that has a shred of evidence connected to Navy and Marine Corps personnel, regardless of rank or position.
Gibbs and Fornell are in close pursuit of an illicit drug operation and its leader; a cadaver disappears from the team's autopsy room. (S18 Ep1)
Flashbacks reveal the murder case that first introduced young Gibbs to NCIS and to Ducky (S18 Ep2)
The team enters the world of 21st century treasure hunting as they investigate two murders; Gibbs and Fornell continue to look for an opioid kingpin. (S18 Ep3)
McGee and his wife's Bahamian vacation is interrupted by an important case; Gibbs worries about the future when his search for Fornell gets violent. (S18 Ep4)
Gibbs and Fornell reach an apex in their crusade for justice for Emily; Gibbs and Vance allow the team to work on a case with possibly dangerous implications. (S18 Ep5)
Drama series following the work of the US navy's dedicated federal agency. An informant is shot dead just as he is about to pass on crucial information. (S18 Ep6)
A Navy officer drives a recently released inmate home shortly before their death, which sends the team on a search to find the murderer; Palmer struggles with a personal trauma. (S18 Ep7)
Gibbs and Sloane search for a group of missing girls in Afghanistan; McGee, Bishop and Torres pursue a hacker who leaked dangerous information to the Taliban. (S18 Ep8)
A victim's body is found frozen in the back of a food truck, which sends the team on an investigative journey into the competitive world of food trucks. (S18 Ep9)
One of the NCIS members makes an unexpected action after the team starts investigating an underground dogfighting operation. (S18 Ep10)
Vance assigns McGee, Torres and Bishop to COVID compliance duty at a foreign affairs summit, where they discover a link to another NCIS team's murder case. (S18 Ep11)
Torres is led to see his father, whom he has not visited since childhood, due to certain pieces of evidence in a case about a Marine sergeant's stabbing. (S18 Ep12)