The team discovers that the terrorists intend to launch a missile attack to frame another nation and spark a global conflict.

This episode marked the long-awaited reunion of Harm and Mac, though it was bittersweet as they revealed they had been living apart for several years to pursue their respective military careers.

The episode ends on a massive cliffhanger with the terrorists launching missiles while Sam, Callen, and Harm are still caught in the middle of the conflict on the ship. Cast and Characters Chris O'Donnell as G. Callen LL Cool J as Sam Hanna Daniela Ruah as Kensi Blye Eric Christian Olsen as Marty Deeks Linda Hunt as Henrietta "Hetty" Lange

The Season 10 finale of NCIS: Los Angeles , titled originally aired on May 19, 2019. It is the concluding chapter of a high-stakes crossover event featuring characters from the original JAG series. Episode Summary: "False Flag" (S10, E24)