NCIS crossover event

The NCIS Crossover Event is a three-part crossover event between NCIS and it's two spin-offs NCIS: Hawaiʻi and NCIS: Los Angeles that aired on CBS on January 9, 2023.

Cast and characters
The following contains a list of actors receiving main billing in the crossover event:

Part 1: NCIS Season 20 Episode 10 "Too Many Cooks"
Agents from Hawaii and Los Angeles convene in DC to attend the retirement party of Dale Harding (Robert Picardo), a beloved FLETC professor, but when he commits suicide that morning the teams work together to determine why he had classified files. McGee is briefly thought to be responsible for treason, though he is cleared of wrongdoing soon after. The case escalates to a manhunt for Simon Williams, whose picture has been on the NCIS Most Wanted wall for a lengthy period, then takes a grim turn when Palmer and Tennant go missing.

Part 2: NCIS: Hawaiʻi Season 2 Episode 10 "Deep Fake"
Tennant and DC medical examiner Jimmy Palmer, along with Los Angeles agent Sam Hanna, are kidnapped and held prisoner by a woman claiming to be a CIA agent investigating Simon Williams. Meanwhile, DC agent-in-charge Parker works with the Hawaii branch to find their missing teammates. They have a similar situation with a CIA agent, who turns out to be an imposter. The team eventually discovers that Simon Williams is the name for a computer program responsible for years worth of data, and that anyone affiliated with it is now in grave danger. Upon discovering that one of the members is none other than his boss, retired Navy Admiral Hollace Kilbride, Sam's partner, NCIS Special Agent G. Callen prepares to return to Los Angeles with Tennant accompanying him.

Part 3: NCIS: Los Angeles Season 14 Episode 10 "A Long Time Coming"
As Kilbride goes missing, Fatima and Roundtree are attacked by gunmen led by rogue CIA agent Morgan Miller with the abduction seeing Roundtree being kidnapped. The team continues to work with their D.C. and Hawaii colleagues to find Roundtree, who is tortured for information on Kilbride's whereabouts while the teams learn their identities have been posted on the Dark Web which means every cartel member, hitman, gang and psychopath are also after them to claim the bounties on their heads.

Production
On October 3, 2022, it was announced that an official three-way crossover between NCIS and it's spin-offs NCIS: Hawaiʻi and NCIS: Los Angeles would air in the beginning of 2023.

Ratings
In the United States, the first part of the crossover was watched live by 7.93 million viewers. The second part was watched live by 7.36 million viewers, while the third and final part was watched live by 6.80 million viewers.